View difference between Paste ID: tzw1Sw78 and 09CMRNeS

 --[[
 		3D Print
 		A printing program for use with NPaintPro
-		But makes for a nice remote-control routine too
+
 		By NitrogenFingers
 ]]--
 
 local activeCommander = -1
 local operatingPrint = false
 
 --Whether or not the print can be ended
 local function endPrint()
 	operatingPrint = false
 end
 
 --The list of all commands the printer can be ginve
 local commandList = {
 	["FW"] = { turtle.dig, turtle.forward };
 	["BK"] = turtle.back;
 	["UP"] = { turtle.digUp, turtle.up };
 	["DW"] = { turtle.digDown, turtle.down };
 	["TL"] = turtle.turnLeft;
 	["TR"] = turtle.turnRight;
 	["TU"] = { turtle.turnLeft, turtle.turnLeft };
 	["PF"] = { turtle.dig, turtle.place };
 	["PU"] = { turtle.digUp, turtle.placeUp };
 	["PD"] = { turtle.digDown, turtle.placeDown };
 	["SS"] = turtle.select;
 	["RF"] = turtle.refuel;
 	["DE"] = endPrint;
 }
 
 --Splits a string according to a pattern into a table
 local function split(str, pattern)
   local t = { }
   local fpat = "(.-)" .. pattern
   local last_end = 1
   local s, e, cap = str:find(fpat, 1)
   while s do
     if s ~= 1 or cap ~= "" then
       table.insert(t,cap)
     end
     last_end = e+1
     s, e, cap = str:find(fpat, last_end)
   end
   if last_end <= #str then
     cap = str:sub(last_end)
     table.insert(t, cap)
   end
   return t
 end
 
 --Listens for any instructions given referring to identification and activation. Once activated, the mode exits.
 local function respondToQuery()
 	while true do
 		print("Listening for ACT/ID query")
 		local id,key = rednet.receive()
 		print("Received : "..key)
 
 		if key == "$3DPRINT IDENTIFY" then
 			print("Requested Identification")
 			rednet.send(id, "$3DPRINT IDACK "..os.getComputerLabel())
 
 		elseif key == "$3DPRINT ACTIVATE" then
 			print("Requested Activation")
 			activeCommander = id
 			rednet.send(id, "$3DPRINT ACTACK")
 			break
 		end
 	end
 end
 
 --Performs the print. Follows instrutions as given, and responds as necessary
 local function performPrint()
 	operatingPrint = true
 	while operatingPrint do
 		local id,msg = rednet.receive()
 		print("Command : "..msg)
 
 		if id == activeCommander and string.find(msg, "$PC") == 1 then
 			local cmds = split(msg, " ")
-			if(tonumber(cmds[3])) and turtle.getItemCount(tonumber(cmds[3])) == 0 then
+
 			--It's a bit of a hack, but those are the 2 methods required for a refuel
 			if turtle.getFuelLevel() == 0 and cmds[2] ~= "SS" and cmds[2] ~= "RF" then
 				rednet.send(id, "$3DPRINT OOF")
 			elseif (tonumber(cmds[3])) and turtle.getItemCount(tonumber(cmds[3])) == 0 and
 					turtle.getFuelLevel() ~= 0 then
 				rednet.send(id, "$3DPRINT DEP")
 			else
 				if cmds[2] == "RF" then cmds[3] = "64" end
 				if type(commandList[cmds[2]]) == "function" then
 					commandList[cmds[2]](tonumber(cmds[3]))
 				elseif type(commandList[cmds[2]]) == "table" then
 					for i=1,#commandList[cmds[2]] do
 						commandList[cmds[2]][i](tonumber(cmds[3]))
 					end
 				end
 
 				rednet.send(activeCommander, "$3DPRINT ACK")
 			end
 		end
 	end
 end
 
 rednet.open("right")
 term.clear()
 term.setCursorPos(1,1)
 if not os.getComputerLabel() then
 	term.write("Name this computer:")
 	os.setComputerLabel(io.read())
 end
 print("3D printer online")
 
 while true do
 	--Wait for activation
 	respondToQuery()
 	--Perform the print
 	performPrint()
 end