diff --git a/sl_robot/commands.lua b/sl_robot/commands.lua
index 1f12c02..78dc94b 100644
--- a/sl_robot/commands.lua
+++ b/sl_robot/commands.lua
@@ -14,6 +14,15 @@
 
 ]]--
 
+-- constrict value to the given range
+local function range(val, min, max)
+	val = tonumber(val)
+	if val < min then return min end
+	if val > max then return max end
+	return val
+end
+
+
 
 sl_robot.register_action("get_ms_time", {
 	cmnd = function(self)
@@ -25,7 +34,7 @@ sl_robot.register_action("get_ms_time", {
 
 sl_robot.register_action("forward", {
 	cmnd = function(self, steps)
-		steps = math.min(tonumber(steps or 1), 100)
+		steps = range(steps, 1, 100)
 		local idx = 1
 		while idx <= steps do
 			local meta = minetest.get_meta(self.meta.pos)
@@ -49,7 +58,7 @@ sl_robot.register_action("forward", {
 
 sl_robot.register_action("backward", {
 	cmnd = function(self, steps)
-		steps = math.min(tonumber(steps or 1), 100)
+		steps = range(steps, 1, 100)
 		local idx = 1
 		while idx <= steps do
 			local meta = minetest.get_meta(self.meta.pos)
@@ -140,8 +149,8 @@ sl_robot.register_action("down", {
 
 sl_robot.register_action("take", {
 	cmnd = function(self, num, slot)
-		num = math.min(tonumber(num or 1), 99)
-		slot = math.min(tonumber(slot or 1), 8)
+		num = range(num, 1, 99)
+		slot = range(slot, 1, 8)
 		local meta = minetest.get_meta(self.meta.pos)
 		local robot_pos = minetest.string_to_pos(meta:get_string("robot_pos"))
 		local robot_param2 = meta:get_int("robot_param2")
@@ -159,8 +168,8 @@ sl_robot.register_action("take", {
 
 sl_robot.register_action("add", {
 	cmnd = function(self, num, slot)
-		num = math.min(tonumber(num or 1), 99)
-		slot = math.min(tonumber(slot or 1), 8)
+		num = range(num, 1, 99)
+		slot = range(slot, 1, 8)
 		local meta = minetest.get_meta(self.meta.pos)
 		local robot_pos = minetest.string_to_pos(meta:get_string("robot_pos"))
 		local robot_param2 = meta:get_int("robot_param2")
@@ -177,7 +186,7 @@ sl_robot.register_action("add", {
 
 sl_robot.register_action("place", {
 	cmnd = function(self, slot, dir)
-		slot = math.min(tonumber(slot or 1), 8)
+		slot = range(slot, 1, 8)
 		local meta = minetest.get_meta(self.meta.pos)
 		local robot_pos = minetest.string_to_pos(meta:get_string("robot_pos"))
 		local robot_param2 = meta:get_int("robot_param2")
@@ -193,7 +202,7 @@ sl_robot.register_action("place", {
 
 sl_robot.register_action("dig", {
 	cmnd = function(self, slot, dir)
-		slot = math.min(tonumber(slot or 1), 8)
+		slot = range(slot, 1, 8)
 		local meta = minetest.get_meta(self.meta.pos)
 		local robot_pos = minetest.string_to_pos(meta:get_string("robot_pos"))
 		local robot_param2 = meta:get_int("robot_param2")
@@ -215,17 +224,3 @@ sl_robot.register_action("stop", {
 	end,
 	help = "tbd"
 })
-
---sl_robot.register_action("run", {
---	cmnd = function(self, sCmd, reverse)
---		slot = math.min(tonumber(slot or 1), 8)
---		local meta = minetest.get_meta(self.meta.pos)
---		local robot_pos = minetest.string_to_pos(meta:get_string("robot_pos"))
---		local robot_param2 = meta:get_int("robot_param2")
-		
---		for cmnd in sCmd:gmatch("%w+") do
---			if cmnd:byte()
---		end
---	end,
---	help = " "
---})
diff --git a/sl_robot/init.lua b/sl_robot/init.lua
index 2dd146b..ecfe824 100644
--- a/sl_robot/init.lua
+++ b/sl_robot/init.lua
@@ -16,3 +16,4 @@ sl_robot = {}
 dofile(minetest.get_modpath("sl_robot") .. "/robot.lua")
 dofile(minetest.get_modpath("sl_robot") .. "/base.lua")
 dofile(minetest.get_modpath("sl_robot") .. "/commands.lua")
+dofile(minetest.get_modpath("sl_robot") .. "/run_cmnd.lua")
diff --git a/sl_robot/robot.lua b/sl_robot/robot.lua
index 40ced31..d8b4548 100644
--- a/sl_robot/robot.lua
+++ b/sl_robot/robot.lua
@@ -23,40 +23,38 @@ local Face2Dir = {[0]=
 
 
 local Inventories = {
-	["default:chest"] = {take = "main", add = "main", fuel = "main"},
-	["default:chest_locked"] = {take = "main", add = "main", fuel = "main"},
-	["default:chest_locked"] = {take = "main", add = "main", fuel = "main"},
-	["default:furnace"] = {take = "dst", add = "src", fuel = "fuel"},
-	["default:furnace_active"] = {take = "dst", add = "src", fuel = "fuel"},
-	["tubelib:distributor"] = {take = "src", add = "src", fuel = "src"},
-	["gravelsieve:sieve"] = {take = "dst", add = "src", fuel = "src"},
-	["gravelsieve:auto_sieve0"] = {take = "dst", add = "src", fuel = "src"},
-	["gravelsieve:auto_sieve1"] = {take = "dst", add = "src", fuel = "src"},
-	["gravelsieve:auto_sieve2"] = {take = "dst", add = "src", fuel = "src"},
-	["gravelsieve:auto_sieve3"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:autocrafter"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:autocrafter_active"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:chest"] = {take = "main", add = "main", fuel = "main"},
-	["tubelib_addons1:fermenter"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:reformer"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:funnel"] = {take = "main", add = "main", fuel = "main"},
-	["tubelib_addons1:grinder"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:grinder_active"] = {take = "dst", add = "src", fuel = "src"},
-	["tubelib_addons1:harvester_base"] = {take = "main", add = "main", fuel = "fuel"},
-	["tubelib_addons1:quarry"] = {take = "main", add = "main", fuel = "fuel"},
-	["tubelib_addons1:quarry_active"] = {take = "main", add = "main", fuel = "fuel"},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
---	[""] = {take = "", add = "", fuel = ""},
+	["tubelib:distributor"] = {take = "src", add = "src"},
+	["tubelib_addons1:harvester_base"] = {take = "main", add = "fuel"},
+	["tubelib_addons1:quarry"] = {take = "main", add = "fuel"},
+	["tubelib_addons1:quarry_active"] = {take = "main", add = "fuel"},
+--	[""] = {take = "", add = ""},
+--	[""] = {take = "", add = ""},
+--	[""] = {take = "", add = ""},
 }
 
+local function inv_list_add(inv, name)
+	if Inventories[name] then
+		return inv:get_list(Inventories[name].add)
+	elseif inv:get_list("src") then
+		return inv:get_list("src")
+	elseif inv:get_list("main") then
+		return inv:get_list("main")
+	end	
+	return nil
+end
+
+local function inv_list_take(inv, name)
+	if Inventories[name] then
+		return inv:get_list(Inventories[name].take)
+	elseif inv:get_list("dst") then
+		return inv:get_list("dst")
+	elseif inv:get_list("main") then
+		return inv:get_list("main")
+	end	
+	return nil
+end
+
+
 -- return the largest stack
 local function peek(src_list)
 	local max_val = 0
@@ -264,19 +262,13 @@ function sl_robot.robot_take(base_pos, robot_pos, param2, owner, num, slot)
 		return
 	end
 	local node = minetest.get_node_or_nil(pos1) or read_node_with_vm(pos1)
-	if Inventories[node.name] then
-		local listname = Inventories[node.name].take
-		local src_inv = minetest.get_inventory({type="node", pos=pos1})
-		if src_inv:is_empty(listname) then
-			return
-		end
-		local src_list = src_inv:get_list(listname)
-		local dst_inv = minetest.get_inventory({type="node", pos=base_pos})
-		local dst_list = dst_inv:get_list("main")
-		if take_num_items(src_list, num, dst_list[slot]) then
-			src_inv:set_list(listname, src_list)
-			dst_inv:set_list("main", dst_list)
-		end
+	local src_inv = minetest.get_inventory({type="node", pos=pos1})
+	local src_list = inv_list_take(src_inv, node.name)
+	local dst_inv = minetest.get_inventory({type="node", pos=base_pos})
+	local dst_list = dst_inv:get_list("main")
+	if src_list and take_num_items(src_list, num, dst_list[slot]) then
+		src_inv:set_list(listname, src_list)
+		dst_inv:set_list("main", dst_list)
 	end
 end
 
@@ -286,12 +278,11 @@ function sl_robot.robot_add(base_pos, robot_pos, param2, owner, num, slot)
 		return
 	end
 	local node = minetest.get_node_or_nil(pos1) or read_node_with_vm(pos1)
-	if Inventories[node.name] then
-		local listname = Inventories[node.name].take
-		local dst_inv = minetest.get_inventory({type="node", pos=pos1})
-		local dst_list = dst_inv:get_list(listname)
-		local src_inv = minetest.get_inventory({type="node", pos=base_pos})
-		local src_list = src_inv:get_list("main")
+	local dst_inv = minetest.get_inventory({type="node", pos=pos1})
+	local dst_list = inv_list_add(dst_inv, node.name)
+	local src_inv = minetest.get_inventory({type="node", pos=base_pos})
+	local src_list = src_inv:get_list("main")
+	if dst_list then
 		local taken = src_list[slot]:take_item(num)
 		if dst_inv:room_for_item(listname, taken) then
 			dst_inv:add_item(listname, taken)
diff --git a/sl_robot/run_cmnd.lua b/sl_robot/run_cmnd.lua
new file mode 100644
index 0000000..a879cc0
--- /dev/null
+++ b/sl_robot/run_cmnd.lua
@@ -0,0 +1,122 @@
+--[[
+
+	sl_robot
+	========
+
+	Copyright (C) 2018 Joachim Stolberg
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	run_cmnd.lua:
+	
+	Register the run command
+
+]]--
+
+local function Reverse(arr)
+	local i, j = 1, #arr
+
+	while i < j do
+		arr[i], arr[j] = arr[j], arr[i]
+
+		i = i + 1
+		j = j - 1
+	end
+end
+
+local switch = {
+	f = function(cmnd) 
+		local num = (cmnd:byte(2) or  0x31) - 0x30
+		print("forward("..num..")")
+	end,
+	b = function(cmnd) 
+		local num = (cmnd:byte(2) or 0x31) - 0x30
+		print("backward("..num..")")
+	end,
+	l = function(cmnd, reverse) 
+		if reverse then
+			print("right()")
+		else
+			print("left()")
+		end
+	end,
+	r = function(cmnd, reverse) 
+		if reverse then
+			print("left()")
+		else
+			print("right()")
+		end
+	end,
+	u = function(cmnd) 
+		print("up()")
+	end,
+	d = function(cmnd) 
+		print("down()")
+	end,
+	t = function(cmnd) 
+		local num, slot
+		if cmnd:sub(2,2) == "s" then
+			num = 99
+			slot = (cmnd:byte(3) or 0x31) - 0x30
+		else
+			num = 1
+			slot = (cmnd:byte(2) or 0x31) - 0x30
+		end
+		print("take("..num..","..slot..")")
+	end,
+	a = function(cmnd) 
+		local num, slot
+		if cmnd:sub(2,2) == "s" then
+			num = 99
+			slot = (cmnd:byte(3) or 0x31) - 0x30
+		else
+			num = 1
+			slot = (cmnd:byte(2) or 0x31) - 0x30
+		end
+		print("add("..num..","..slot..")")
+	end,
+	p = function(cmnd) 
+		local num, slot
+		if cmnd:sub(2,2) == "u" then
+			slot = (cmnd:byte(3) or 0x31) - 0x30
+			print("place("..slot..",U)")
+		elseif cmnd:sub(2,2) == "d" then
+			slot = (cmnd:byte(3) or 0x31) - 0x30
+			print("place("..slot..",D)")
+		else
+			slot = (cmnd:byte(2) or 0x31) - 0x30
+			print("place("..slot..")")
+		end
+	end,
+	e = function(cmnd)
+		print(cmnd.." is a invalid command")
+	end,
+}
+
+local function run(task, reverse)
+	task = task:gsub("\n", " ")
+	task = task:gsub("\t", " ")
+	local cmnds = task:split(" ")
+	if reverse then
+		Reverse(cmnds)
+	end
+	for i,cmnd in ipairs(cmnds) do
+		(switch[cmnd:sub(1,1)] or switch["e"])(cmnd, reverse)
+	end
+end
+
+sl_robot.register_action("run", {
+	cmnd = function(self, sCmndList, reverse)
+		sCmndList = sCmndList:gsub("\n", " ")
+		sCmndList = sCmndList:gsub("\t", " ")
+		local cmnds = sCmndList:split(" ")
+		if reverse then
+			Reverse(cmnds)
+		end
+		for i,cmnd in ipairs(cmnds) do
+			(switch[cmnd:sub(1,1)] or switch["e"])(cmnd, reverse)
+		end
+	end,
+	help = " "
+})
diff --git a/tubelib_addons1/init.lua b/tubelib_addons1/init.lua
index 48cd012..6ef127f 100644
--- a/tubelib_addons1/init.lua
+++ b/tubelib_addons1/init.lua
@@ -19,4 +19,4 @@ dofile(minetest.get_modpath("tubelib_addons1") .. '/fermenter.lua')
 dofile(minetest.get_modpath("tubelib_addons1") .. '/reformer.lua')
 dofile(minetest.get_modpath("tubelib_addons1") .. '/funnel.lua')
 dofile(minetest.get_modpath("tubelib_addons1") .. "/pusher_fast.lua")
-dofile(minetest.get_modpath("tubelib_addons1") .. '/chest.lua')
+dofile(minetest.get_modpath("tubelib_addons1") .. '/chest.lua')
\ No newline at end of file
diff --git a/tubelib_addons1/textures/tubelib_addons1_autocrafter.png b/tubelib_addons1/textures/tubelib_addons1_autocrafter.png
index fbc1d2c..c831b2b 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_autocrafter_active.png b/tubelib_addons1/textures/tubelib_addons1_autocrafter_active.png
index 6f3f59b..3e35ef1 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_biofuel.png b/tubelib_addons1/textures/tubelib_addons1_biofuel.png
index 047391a..d91aaac 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_biogas.png b/tubelib_addons1/textures/tubelib_addons1_biogas.png
index 5562895..9d56049 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_fermenter_bottom.png b/tubelib_addons1/textures/tubelib_addons1_fermenter_bottom.png
index 62c084e..d9d1ac8 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_fermenter_inventory.png b/tubelib_addons1/textures/tubelib_addons1_fermenter_inventory.png
index 324fd28..a4795a5 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_fermenter_top.png b/tubelib_addons1/textures/tubelib_addons1_fermenter_top.png
index 52efab6..d361b5f 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_funnel.png b/tubelib_addons1/textures/tubelib_addons1_funnel.png
index 3f89c0f..467342e 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_funnel_top.png b/tubelib_addons1/textures/tubelib_addons1_funnel_top.png
index fccbbb9..f18d0b6 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_grinder.png b/tubelib_addons1/textures/tubelib_addons1_grinder.png
index 88855b7..87e5c58 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_grinder_active.png b/tubelib_addons1/textures/tubelib_addons1_grinder_active.png
index 704b17b..1707d23 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_harvester.png b/tubelib_addons1/textures/tubelib_addons1_harvester.png
index 22f96f9..412e686 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_harvester_top.png b/tubelib_addons1/textures/tubelib_addons1_harvester_top.png
index 4c8d5f2..0237ce3 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_pusher.png b/tubelib_addons1/textures/tubelib_addons1_pusher.png
index d623a76..96c01e0 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_quarry.png b/tubelib_addons1/textures/tubelib_addons1_quarry.png
index 3d59f1e..dd9bd06 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_quarry_active.png b/tubelib_addons1/textures/tubelib_addons1_quarry_active.png
index 8561d48..e7b5e81 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_quarry_passive.png b/tubelib_addons1/textures/tubelib_addons1_quarry_passive.png
index 86e86eb..a1be3f4 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_reformer2_bottom.png b/tubelib_addons1/textures/tubelib_addons1_reformer2_bottom.png
index 245b784..994be75 100644
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diff --git a/tubelib_addons1/textures/tubelib_addons1_reformer2_top.png b/tubelib_addons1/textures/tubelib_addons1_reformer2_top.png
index 8f757e4..52ff340 100644
Binary files a/tubelib_addons1/textures/tubelib_addons1_reformer2_top.png and b/tubelib_addons1/textures/tubelib_addons1_reformer2_top.png differ
diff --git a/tubelib_addons1/textures/tubelib_addons1_reformer_inventory.png b/tubelib_addons1/textures/tubelib_addons1_reformer_inventory.png
index fe9d3d6..171ece1 100644
Binary files a/tubelib_addons1/textures/tubelib_addons1_reformer_inventory.png and b/tubelib_addons1/textures/tubelib_addons1_reformer_inventory.png differ
diff --git a/tubelib_addons3/chest.lua b/tubelib_addons3/chest.lua
new file mode 100644
index 0000000..3a1159e
--- /dev/null
+++ b/tubelib_addons3/chest.lua
@@ -0,0 +1,137 @@
+--[[
+
+	Tubelib Addons 3
+	================
+
+	Copyright (C) 2018 Joachim Stolberg
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+	
+	chest.lua
+	
+	A high performance chest
+
+]]--
+
+
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	minetest.log("action", player:get_player_name().." moves "..stack:get_name()..
+			" to chest at "..minetest.pos_to_string(pos))
+	return stack:get_count()
+end
+
+local function allow_metadata_inventory_take(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	minetest.log("action", player:get_player_name().." takes "..stack:get_name()..
+			" from chest at "..minetest.pos_to_string(pos))
+	return stack:get_count()
+end
+
+local function get_stack(meta, list)
+	local inv = meta:get_inventory()
+	local item = tubelib.get_item(meta, list)
+	if item and inv:contains_item(list, item) then
+		-- try to remove a complete stack
+		item:set_count(98)
+		local taken = inv:remove_item(list, item)
+		-- add the already removed
+		taken:set_count(taken:get_count() + 1)
+		return taken
+	end
+	return item 
+end
+
+
+local function formspec()
+	return "size[12,10]"..
+	default.gui_bg..
+	default.gui_bg_img..
+	default.gui_slots..
+	"list[context;main;0,0;12,6;]"..
+	"list[current_player;main;2,6.3;8,4;]"..
+	"listring[context;main]"..
+	"listring[current_player;main]"
+end
+
+minetest.register_node("tubelib_addons3:chest", {
+	description = "HighPerf Chest",
+	tiles = {
+		-- up, down, right, left, back, front
+		'tubelib_addons3_chest_bottom.png',
+		'tubelib_addons3_chest_bottom.png',
+		"tubelib_addons3_chest_side.png",
+		"tubelib_addons3_chest_side.png",
+		"tubelib_addons3_chest_side.png",
+		"tubelib_addons3_chest_front.png",
+	},
+
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		inv:set_size('main', 72)
+	end,
+	
+	after_place_node = function(pos, placer)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec", formspec())
+		meta:set_string("infotext", "HighPerf Chest")
+	end,
+
+	can_dig = function(pos,player)
+		if minetest.is_protected(pos, player:get_player_name()) then
+			return false
+		end
+		local meta = minetest.get_meta(pos);
+		local inv = meta:get_inventory()
+		return inv:is_empty("main")
+	end,
+	
+	on_dig = function(pos, node, puncher, pointed_thing)
+		minetest.node_dig(pos, node, puncher, pointed_thing)
+	end,
+
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = {choppy=2, cracky=2, crumbly=2},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+
+minetest.register_craft({
+	output = "tubelib_addons3:chest",
+	recipe = {
+		{"", "default:steel_ingot", ""},
+		{"tubelib_addons1:chest", "default:gold_ingot", "tubelib_addons1:chest"},
+		{"", "default:tin_ingot", ""},
+	}
+})
+
+tubelib.register_node("tubelib_addons3:chest", {}, {
+	on_pull_item = function(pos, side)
+		local meta = minetest.get_meta(pos)
+		return get_stack(meta, "main")
+	end,
+	on_push_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		tubelib.put_item(meta, "main", item)
+	end,
+	on_unpull_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		return tubelib.put_item(meta, "main", item)
+	end,
+	
+	on_recv_message = function(pos, topic, payload)
+		return "unsupported"
+	end,
+})	
diff --git a/tubelib_addons3/depends.txt b/tubelib_addons3/depends.txt
new file mode 100644
index 0000000..278e6ab
--- /dev/null
+++ b/tubelib_addons3/depends.txt
@@ -0,0 +1,3 @@
+tubelib
+tubelib_addons1
+default
diff --git a/tubelib_addons3/description.txt b/tubelib_addons3/description.txt
new file mode 100644
index 0000000..317b0eb
--- /dev/null
+++ b/tubelib_addons3/description.txt
@@ -0,0 +1,2 @@
+Tubelib Extension with High Performance nodes
+
diff --git a/tubelib_addons3/distributor.lua b/tubelib_addons3/distributor.lua
new file mode 100644
index 0000000..0357a20
--- /dev/null
+++ b/tubelib_addons3/distributor.lua
@@ -0,0 +1,491 @@
+--[[
+
+	Tubelib Addons 3
+	================
+
+	Copyright (C) 2018 Joachim Stolberg
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	distributor.lua:
+	
+	A high performance distributor
+]]--
+
+local NUM_FILTER_ELEM = 6
+local NUM_FILTER_SLOTS = 4
+local TICKS_TO_SLEEP = 5
+local CYCLE_TIME = 2
+local STOP_STATE = 0
+local STANDBY_STATE = -1
+
+-- Get one item-stack from the given ItemList, specified by stack number (1..n).
+-- Returns nil if ItemList is empty.
+local function get_this_stack(meta, listname, number)
+	if meta == nil or meta.get_inventory == nil then return nil end
+	local inv = meta:get_inventory()
+	if inv:is_empty(listname) then
+		return nil
+	end
+	
+	local items = inv:get_stack(listname, number)
+	if items:get_count() > 0 then
+		return inv:remove_item(listname, items)
+	end
+	return nil
+end
+
+-- Return a key/value table with all items and the corresponding stack numbers
+local function invlist_content_as_kvlist(list)
+	local res = {}
+	for idx,items in ipairs(list) do
+		local name = items:get_name()
+		if name ~= "" then
+			res[name] = idx
+		end
+	end
+	return res
+end
+
+-- Return the total number of list entries
+local function invlist_num_entries(list)
+	local res = 0
+	for _,items in ipairs(list) do
+		local name = items:get_name()
+		if name ~= "" then
+			res = res + items:get_count()
+		end
+	end
+	return res
+end
+
+-- Return a flat table with all items
+local function invlist_entries_as_list(list)
+	local res = {}
+	for _,items in ipairs(list) do
+		local name = items:get_name()
+		local count = items:get_count()
+		if name ~= "" then
+			for i = 1,count do
+				res[#res+1] = name
+			end
+		end
+	end
+	return res
+end
+
+
+local function AddToTbl(kvTbl, new_items)
+	for _, l in ipairs(new_items) do 
+		kvTbl[l] = true 
+	end
+	return kvTbl
+end
+
+
+local function distributor_formspec(state, filter)
+	return "size[10,8.5]"..
+	default.gui_bg..
+	default.gui_bg_img..
+	default.gui_slots..
+	"list[context;src;0,0;2,4;]"..
+	"image[2,1.5;1,1;tubelib_gui_arrow.png]"..
+	"image_button[2,3;1,1;".. tubelib.state_button(state) ..";button;]"..
+	"checkbox[3,0;filter1;On;"..dump(filter[1]).."]"..
+	"checkbox[3,1;filter2;On;"..dump(filter[2]).."]"..
+	"checkbox[3,2;filter3;On;"..dump(filter[3]).."]"..
+	"checkbox[3,3;filter4;On;"..dump(filter[4]).."]"..
+	"image[3.6,0;0.3,1;tubelib_red.png]"..
+	"image[3.6,1;0.3,1;tubelib_green.png]"..
+	"image[3.6,2;0.3,1;tubelib_blue.png]"..
+	"image[3.6,3;0.3,1;tubelib_yellow.png]"..
+	"list[context;red;4,0;6,1;]"..
+	"list[context;green;4,1;6,1;]"..
+	"list[context;blue;4,2;6,1;]"..
+	"list[context;yellow;4,3;6,1;]"..
+	"list[current_player;main;1,4.5;8,4;]"..
+	"listring[context;src]"..
+	"listring[current_player;main]"
+end
+
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local list = inv:get_list(listname)
+	
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	if listname == "src" then
+		return stack:get_count()
+	elseif invlist_num_entries(list) < NUM_FILTER_ELEM then
+		return 1
+	end
+	return 0
+end
+
+local function allow_metadata_inventory_take(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	return stack:get_count()
+end
+
+local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local stack = inv:get_stack(from_list, from_index)
+	return allow_metadata_inventory_put(pos, to_list, to_index, stack, player)
+end
+
+local SlotColors = {"red", "green", "blue", "yellow"}
+local Num2Ascii = {"B", "L", "F", "R"} -- color to side translation
+local FilterCache = {} -- local cache for filter settings
+
+local function filter_settings(pos)
+	local hash = minetest.hash_node_position(pos)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local filter = minetest.deserialize(meta:get_string("filter")) or {false,false,false,false}
+	local kvFilterItemNames = {} -- {<item:name> = true,...}
+	local kvSide2ItemNames = {} -- {"F" = {<item:name>,...},...}
+	
+	-- collect all filter settings
+	for idx,slot in ipairs(SlotColors) do
+		local side = Num2Ascii[idx]
+		if filter[idx] == true then
+			local list = inv:get_list(slot)
+			local filter = invlist_entries_as_list(list)
+			AddToTbl(kvFilterItemNames, filter)
+			kvSide2ItemNames[side] = filter
+		end
+	end
+	
+	FilterCache[hash] = {
+		kvFilterItemNames = kvFilterItemNames, 
+		kvSide2ItemNames = kvSide2ItemNames
+	}
+end
+
+local function start_the_machine(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	meta:set_int("running", TICKS_TO_SLEEP)
+	node.name = "tubelib_addons3:distributor_active"
+	minetest.swap_node(pos, node)
+	meta:set_string("infotext", "HighPerf Distributor "..number..": running")
+	local filter = minetest.deserialize(meta:get_string("filter"))
+	meta:set_string("formspec", distributor_formspec(tubelib.RUNNING, filter))
+	minetest.get_node_timer(pos):start(CYCLE_TIME)
+	return false
+end
+
+local function stop_the_machine(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	meta:set_int("running", STOP_STATE)
+	node.name = "tubelib_addons3:distributor"
+	minetest.swap_node(pos, node)
+	meta:set_string("infotext", "HighPerf Distributor "..number..": stopped")
+	local filter = minetest.deserialize(meta:get_string("filter"))
+	meta:set_string("formspec", distributor_formspec(tubelib.STOPPED, filter))
+	minetest.get_node_timer(pos):stop()
+	return false
+end
+
+local function goto_sleep(pos)
+	local node = minetest.get_node(pos)
+	local meta = minetest.get_meta(pos)
+	local number = meta:get_string("number")
+	meta:set_int("running", STANDBY_STATE)
+	node.name = "tubelib_addons3:distributor"
+	minetest.swap_node(pos, node)
+	meta:set_string("infotext", "HighPerf Distributor "..number..": standby")
+	local filter = minetest.deserialize(meta:get_string("filter"))
+	meta:set_string("formspec", distributor_formspec(tubelib.STANDBY, filter))
+	minetest.get_node_timer(pos):start(CYCLE_TIME * TICKS_TO_SLEEP)
+	return false
+end	
+
+-- move items to the output slots
+local function keep_running(pos, elapsed)
+	local meta = minetest.get_meta(pos)
+	local running = meta:get_int("running") - 1
+	local player_name = meta:get_string("player_name")
+	--print("running", running)
+	local slot_idx = meta:get_int("slot_idx") or 1
+	meta:set_int("slot_idx", (slot_idx + 1) % NUM_FILTER_SLOTS)
+	local side = Num2Ascii[slot_idx+1]
+	local listname = SlotColors[slot_idx+1]
+	local inv = meta:get_inventory()
+	local list = inv:get_list("src")
+	local kvSrc = invlist_content_as_kvlist(list)
+	local counter = minetest.deserialize(meta:get_string("item_counter")) or 
+			{red=0, green=0, blue=0, yellow=0}
+	
+	-- calculate the filter settings only once
+	local hash = minetest.hash_node_position(pos)
+	if FilterCache[hash] == nil then
+		filter_settings(pos)
+	end
+	
+	-- read data from Cache 
+	-- all filter items as key/value  {<item:name> = true,...}
+	local kvFilterItemNames = FilterCache[hash].kvFilterItemNames
+	-- filter items of one slot as list  {<item:name>,...}
+	local names = FilterCache[hash].kvSide2ItemNames[side]
+	
+	if names == nil then
+		-- this slot is empty
+		return true
+	end
+	
+	local busy = false
+	-- move items from configured filters to the output
+	if next(names) then
+		for _,name in ipairs(names) do
+			if kvSrc[name] then
+				local item = get_this_stack(meta, "src", kvSrc[name])
+				if item then
+					if not tubelib.push_items(pos, side, item, player_name) then
+						tubelib.put_item(meta, "src", item)
+					else
+						counter[listname] = counter[listname] + 1
+						busy = true
+					end
+				end
+			end
+		end
+	end
+	
+	-- move additional items from unconfigured filters to the output
+	if next(names) == nil then
+		for name,_ in pairs(kvSrc) do
+			if kvFilterItemNames[name] == nil then  -- not in the filter so far?
+				local item = get_this_stack(meta, "src", kvSrc[name])
+				if item then
+					if not tubelib.push_items(pos, side, item, player_name) then
+						tubelib.put_item(meta, "src", item)
+					else
+						counter[listname] = counter[listname] + 1
+						busy = true
+					end
+				end
+			end
+		end
+	end
+	
+	if busy == true then 
+		if running <= 0 then
+			return start_the_machine(pos)
+		else
+			running = TICKS_TO_SLEEP
+		end
+	else
+		if running <= 0 then
+			return goto_sleep(pos)
+		end
+	end
+	
+	meta:set_string("item_counter", minetest.serialize(counter))
+	meta:set_int("running", running)
+	return true
+end
+
+local function on_receive_fields(pos, formname, fields, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return
+	end
+	local meta = minetest.get_meta(pos)
+	local running = meta:get_int("running")
+	local filter = minetest.deserialize(meta:get_string("filter"))
+	if fields.filter1 ~= nil then
+		filter[1] = fields.filter1 == "true"
+	elseif fields.filter2 ~= nil then
+		filter[2] = fields.filter2 == "true"
+	elseif fields.filter3 ~= nil then
+		filter[3] = fields.filter3 == "true"
+	elseif fields.filter4 ~= nil then
+		filter[4] = fields.filter4 == "true"
+	end
+	meta:set_string("filter", minetest.serialize(filter))
+	
+	filter_settings(pos)
+	
+	if fields.button ~= nil then
+		if running > STOP_STATE then
+			stop_the_machine(pos)
+		else
+			start_the_machine(pos)
+		end
+	else
+		meta:set_string("formspec", distributor_formspec(tubelib.state(running), filter))
+	end
+end
+
+-- tubelib command to turn on/off filter channels
+local function change_filter_settings(pos, slot, val)
+	local slots = {["red"] = 1, ["green"] = 2, ["blue"] = 3, ["yellow"] = 4}
+	local meta = minetest.get_meta(pos)
+	local filter = minetest.deserialize(meta:get_string("filter"))
+	local num = slots[slot] or 1
+	if num >= 1 and num <= 4 then
+		filter[num] = val == "on"
+	end
+	meta:set_string("filter", minetest.serialize(filter))
+	
+	filter_settings(pos)
+	
+	local running = meta:get_int("running")
+	meta:set_string("formspec", distributor_formspec(tubelib.state(running), filter))
+	return true
+end
+
+minetest.register_node("tubelib_addons3:distributor", {
+	description = "HighPerf Distributor",
+	tiles = {
+		-- up, down, right, left, back, front
+		'tubelib_distributor.png^tubelib_addons3_node_frame.png',
+		'tubelib_distributor.png^tubelib_addons3_node_frame.png',
+		'tubelib_distributor_yellow.png^tubelib_addons3_node_frame.png',
+		'tubelib_distributor_green.png^tubelib_addons3_node_frame.png',
+		"tubelib_distributor_red.png^tubelib_addons3_node_frame.png",
+		"tubelib_distributor_blue.png^tubelib_addons3_node_frame.png",
+	},
+
+	after_place_node = function(pos, placer)
+		local number = tubelib.add_node(pos, "tubelib_addons3:distributor")
+		local meta = minetest.get_meta(pos)
+		meta:set_string("player_name", placer:get_player_name())
+
+		local filter = {false,false,false,false}
+		meta:set_string("formspec", distributor_formspec(tubelib.STOPPED, filter))
+		meta:set_string("filter", minetest.serialize(filter))
+		meta:set_string("number", number)
+		meta:set_string("infotext", "HighPerf Distributor "..number..": stopped")
+		local inv = meta:get_inventory()
+		inv:set_size('src', 8)
+		inv:set_size('yellow', 6)
+		inv:set_size('green', 6)
+		inv:set_size('red', 6)
+		inv:set_size('blue', 6)
+		meta:set_string("item_counter", minetest.serialize({red=0, green=0, blue=0, yellow=0}))
+	end,
+
+	on_receive_fields = on_receive_fields,
+
+	on_dig = function(pos, node, puncher, pointed_thing)
+		if minetest.is_protected(pos, puncher:get_player_name()) then
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		if inv:is_empty("src") then
+			minetest.node_dig(pos, node, puncher, pointed_thing)
+			tubelib.remove_node(pos)
+		end
+	end,
+
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	allow_metadata_inventory_move = allow_metadata_inventory_move,
+
+	on_timer = keep_running,
+	on_rotate = screwdriver.disallow,
+	
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = {choppy=2, cracky=2, crumbly=2},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+
+minetest.register_node("tubelib_addons3:distributor_active", {
+	description = "HighPerf Distributor",
+	tiles = {
+		-- up, down, right, left, back, front
+		{
+			image = "tubelib_addons3_distributor_active.png",
+			backface_culling = false,
+			animation = {
+				type = "vertical_frames",
+				aspect_w = 32,
+				aspect_h = 32,
+				length = 2.0,
+			},
+		},
+		'tubelib_distributor.png^tubelib_addons3_node_frame.png',
+		'tubelib_distributor_yellow.png^tubelib_addons3_node_frame.png',
+		'tubelib_distributor_green.png^tubelib_addons3_node_frame.png',
+		"tubelib_distributor_red.png^tubelib_addons3_node_frame.png",
+		"tubelib_distributor_blue.png^tubelib_addons3_node_frame.png",
+	},
+
+	on_receive_fields = on_receive_fields,
+	
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	allow_metadata_inventory_move = allow_metadata_inventory_move,
+
+	on_timer = keep_running,
+	on_rotate = screwdriver.disallow,
+
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = {crumbly=0, not_in_creative_inventory=1},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+minetest.register_craft({
+	output = "tubelib_addons3:distributor",
+	recipe = {
+		{"", "default:steel_ingot", ""},
+		{"default:gold_ingot", "tubelib:distributor", "default:tin_ingot"},
+		{"", "default:steel_ingot", ""},
+	},
+})
+
+
+tubelib.register_node("tubelib_addons3:distributor", {"tubelib_addons3:distributor_active"}, {
+	on_pull_item = function(pos, side)
+		local meta = minetest.get_meta(pos)
+		return tubelib.get_item(meta, "src")
+	end,
+	on_push_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		return tubelib.put_item(meta, "src", item)
+	end,
+	on_unpull_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		return tubelib.put_item(meta, "src", item)
+	end,
+	on_recv_message = function(pos, topic, payload)
+		if topic == "on" then
+			return start_the_machine(pos)
+		elseif topic == "off" then
+			return stop_the_machine(pos)
+		elseif topic == "state" then
+			local meta = minetest.get_meta(pos)
+			local running = meta:get_int("running")
+			return tubelib.statestring(running)
+		elseif topic == "filter" then
+			return change_filter_settings(pos, payload.slot, payload.val)
+		elseif topic == "counter" then
+			local meta = minetest.get_meta(pos)
+			return minetest.deserialize(meta:get_string("item_counter")) or 
+					{red=0, green=0, blue=0, yellow=0}
+		elseif topic == "clear_counter" then
+			local meta = minetest.get_meta(pos)
+			meta:set_string("item_counter", minetest.serialize({red=0, green=0, blue=0, yellow=0}))
+		else
+			return "unsupported"
+		end
+	end,
+})	
diff --git a/tubelib_addons3/init.lua b/tubelib_addons3/init.lua
new file mode 100644
index 0000000..be003d1
--- /dev/null
+++ b/tubelib_addons3/init.lua
@@ -0,0 +1,15 @@
+--[[
+
+	Tubelib Addons 3
+	================
+
+	Copyright (C) 2018 Joachim Stolberg
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+]]--
+
+dofile(minetest.get_modpath("tubelib_addons3") .. '/pushing_chest.lua')
+dofile(minetest.get_modpath("tubelib_addons3") .. '/chest.lua')
+dofile(minetest.get_modpath("tubelib_addons3") .. '/distributor.lua')
\ No newline at end of file
diff --git a/tubelib_addons3/mod.conf b/tubelib_addons3/mod.conf
new file mode 100644
index 0000000..c545ead
--- /dev/null
+++ b/tubelib_addons3/mod.conf
@@ -0,0 +1 @@
+name=tubelib_addons3
diff --git a/tubelib_addons3/pushing_chest.lua b/tubelib_addons3/pushing_chest.lua
new file mode 100644
index 0000000..07dc1bd
--- /dev/null
+++ b/tubelib_addons3/pushing_chest.lua
@@ -0,0 +1,203 @@
+--[[
+
+	Tubelib Addons 3
+	================
+
+	Copyright (C) 2017-2018 Joachim Stolberg
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+	
+	pushing_chest.lua
+	
+	A high performance pushing chest
+
+]]--
+
+
+local Cache = {}
+
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	Cache[minetest.get_meta(pos):get_string("number")] = nil
+	minetest.log("action", player:get_player_name().." moves "..stack:get_name()..
+			" to chest at "..minetest.pos_to_string(pos))
+	return stack:get_count()
+end
+
+local function allow_metadata_inventory_take(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	Cache[minetest.get_meta(pos):get_string("number")] = nil
+	minetest.log("action", player:get_player_name().." takes "..stack:get_name()..
+			" from chest at "..minetest.pos_to_string(pos))
+	return stack:get_count()
+end
+
+local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	Cache[minetest.get_meta(pos):get_string("number")] = nil
+	return count
+end	
+
+local function configured(pos, item)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local number = meta:get_string("number")
+	if not Cache[number] then
+		Cache[number] = {}
+		for _,items in ipairs(inv:get_list("main")) do
+			Cache[number][items:get_name()] = true
+		end
+	end
+	return Cache[number][item:get_name()] == true
+end
+
+local function shift_items(pos, elapsed)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	if not inv:is_empty("shift") then
+		local number = meta:get_string("number")
+		local player_name = meta:get_string("player_name")
+		local offs = meta:get_int("offs")
+		meta:set_int("offs", offs + 1)
+		for i = 0,7 do
+			local idx = ((i + offs) % 8) + 1
+			local stack = inv:get_stack("shift", idx)
+			if stack:get_count() > 0 then
+				if tubelib.push_items(pos, "R", stack, player_name) then
+					inv:set_stack("shift", idx, nil)
+					return true
+				end
+			end
+		end
+	end
+	return true
+end
+
+local function formspec()
+	return "size[9,9.2]"..
+	default.gui_bg..
+	default.gui_bg_img..
+	default.gui_slots..
+	"list[context;shift;0.5,0;8,1;]"..
+	"list[context;main;0.5,1.2;8,4;]"..
+	"image[0.5,0;1,1;tubelib_gui_arrow.png]"..
+	"image[7.5,0;1,1;tubelib_gui_arrow.png]"..
+	"list[current_player;main;0.5,5.5;8,4;]"..
+	"image[0.5,1.2;1,1;tubelib_gui_arrow.png^[transformR270]"..
+	"listring[context;main]"..
+	"listring[current_player;main]"
+end
+
+minetest.register_node("tubelib_addons3:pushing_chest", {
+	description = "HighPerf Pushing Chest",
+	tiles = {
+		-- up, down, right, left, back, front
+		{
+			image = "tubelib_addons3_pushing_chest.png",
+			backface_culling = false,
+			animation = {
+				type = "vertical_frames",
+				aspect_w = 32,
+				aspect_h = 32,
+				length = 2.0,
+			},
+		},
+		'tubelib_addons3_chest_bottom.png',
+		"tubelib_addons3_chest_out.png",
+		"tubelib_addons3_chest_side.png",
+		"tubelib_addons3_chest_side.png",
+		"tubelib_addons3_chest_front.png",
+	},
+
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		inv:set_size('main', 32)
+		inv:set_size('shift', 8)
+	end,
+	
+	after_place_node = function(pos, placer)
+		local meta = minetest.get_meta(pos)
+		local number = tubelib.add_node(pos, "tubelib_addons3:pushing_chest")	
+		meta:set_string("player_name", placer:get_player_name())
+		meta:set_string("number", number)
+		meta:set_string("formspec", formspec())
+		meta:set_string("infotext", "HighPerf Pushing Chest "..number)
+		minetest.get_node_timer(pos):start(2)
+	end,
+
+	can_dig = function(pos,player)
+		if minetest.is_protected(pos, player:get_player_name()) then
+			return false
+		end
+		local meta = minetest.get_meta(pos);
+		local inv = meta:get_inventory()
+		return inv:is_empty("main") and inv:is_empty("shift")
+	end,
+	
+	on_dig = function(pos, node, puncher, pointed_thing)
+		minetest.node_dig(pos, node, puncher, pointed_thing)
+	end,
+
+	allow_metadata_inventory_put = allow_metadata_inventory_put,
+	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	allow_metadata_inventory_move = allow_metadata_inventory_move,
+
+	on_timer = shift_items,
+	on_rotate = screwdriver.disallow,
+	
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = {choppy=2, cracky=2, crumbly=2},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+
+minetest.register_craft({
+	output = "tubelib_addons3:pushing_chest",
+	recipe = {
+		{ "", "default:tin_ingot", ""},
+		{"default:chest", "default:gold_ingot", "tubelib:distributor"},
+		{"", "default:steel_ingot", ""},
+	}
+})
+
+tubelib.register_node("tubelib_addons3:pushing_chest", {}, {
+	on_pull_item = function(pos, side)
+		local meta = minetest.get_meta(pos)
+		local item = tubelib.get_item(meta, "main")
+		-- check if one remaining item is left
+		if meta:get_inventory():contains_item("main", item) then
+			return item 
+		else
+			-- don't remove the last item (recipe)
+			tubelib.put_item(meta, "main", item)
+			return nil 
+		end
+	end,
+	on_push_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		if configured(pos, item) then
+			return tubelib.put_item(meta, "main", item)
+		else
+			return tubelib.put_item(meta, "shift", item)
+		end
+	end,
+	on_unpull_item = function(pos, side, item)
+		local meta = minetest.get_meta(pos)
+		return tubelib.put_item(meta, "main", item)
+	end,
+	
+	on_recv_message = function(pos, topic, payload)
+		return "unsupported"
+	end,
+})	
diff --git a/tubelib_addons3/textures/tubelib_addons3_chest_bottom.png b/tubelib_addons3/textures/tubelib_addons3_chest_bottom.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_chest_front.png b/tubelib_addons3/textures/tubelib_addons3_chest_front.png
new file mode 100644
index 0000000..782d5ef
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diff --git a/tubelib_addons3/textures/tubelib_addons3_chest_out.png b/tubelib_addons3/textures/tubelib_addons3_chest_out.png
new file mode 100644
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diff --git a/tubelib_addons3/textures/tubelib_addons3_chest_side.png b/tubelib_addons3/textures/tubelib_addons3_chest_side.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_distributor_active.png b/tubelib_addons3/textures/tubelib_addons3_distributor_active.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_node_frame.png b/tubelib_addons3/textures/tubelib_addons3_node_frame.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_pushing_chest.png b/tubelib_addons3/textures/tubelib_addons3_pushing_chest.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_stack_chest_front.png b/tubelib_addons3/textures/tubelib_addons3_stack_chest_front.png
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diff --git a/tubelib_addons3/textures/tubelib_addons3_stack_chest_side.png b/tubelib_addons3/textures/tubelib_addons3_stack_chest_side.png
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