View difference between Paste ID: zGe8HsnG and Dn6dNNWv

 local location = {0,0,0}
 local origin = {0,0,0}
 local dir=1
 local modX= {0,1,0,-1}
 local modZ = {1,0,-1,0}
 local max = {144,2,72}
 turtle.select(1)
 
 function turnLeft()
   turtle.turnLeft()
   dir = dir - 1
   if dir < 1 then dir = 4 end
 end
 
 function turnAround()
   turnLeft()
   turnLeft()
 end
 
 function turnRight()
   turtle.turnRight()
   dir = dir + 1
   if dir > 4 then dir = 1 end
 end
 
 function addLocStep()
   location[1] = location[1] + modX[dir]
   location[3] = location[3] + modZ[dir]
 end
 
 function subLocStep()
   location[1] = location[1] - modX[dir]
   location[3] = location[3] - modZ[dir]
 end
 
 function forward()
   local b = turtle.forward()
   if b then
     addLocStep()
     return true
   else
     return false
   end
 end
 
 function back()
   local b = turtle.back()
   if b then
     subLocStep()
 	return true
   else
     return false
   end
 end
 
 function dig()
   c=0
   while turtle.detect() do
     turtle.dig()
 	c = c+1
 	if c > 10 then
 	  sleep(0.1)
 	  c=0
 	end
   end
 end
 
 function digUp()
   while turtle.detectUp() do
     turtle.digUp()
 	sleep(0)
   end
 end
 
 function digDown()
   while turtle.detectDown() do
     turtle.digDown()
   end
 end
 
 function digForward()
   while forward() == false do
     dig()
   end
 end
 
 function digBack()
   while back() == false do
     turnAround()
     dig()
 	turnAround()
 	sleep(0)
   end
 end
 
 function turnOriginLeft()
   while dir ~= 4 do
     turnLeft()
   end
 end
 
 function turnOriginRight()
   while dir ~= 2 do
     turnLeft()
   end
 end
 
 function turnOriginDown()
   while dir ~= 3 do
     turnLeft()
   end
 end
 
 function turnOriginUp()
   while dir ~= 1 do
     turnLeft()
   end
 end
 
 
 local input = ""
 while input ~= "start" do
   input = read()
   sleep(0)
 end
 
 function checkInventory()
   if turtle.getItemCount(9) > 0 then
     return true
   else
     return false
   end
 end
 
 function getLocCopy()
   local copy = {}
   for i,n in ipairs(location) do
     copy[i] = n
   end
   return copy
 end
 
 function doDropOff(goBack)
   local orgDir = dir
   local orgPos = getLocCopy()
   moveToOrigin()
   turnOriginDown()
   forward()
   forward()
   dropAll()
   moveToOrigin()
   if goBack then
-	moveTo(orgPos[1],origin[3])
+	moveTo(origin[1],orgPos[3])
 	moveTo(orgPos[1],orgPos[3])
 	while orgDir ~= dir do
 		turnLeft()
 		sleep(0)
 	end
   end
 end
 
 function dropAll()
   for i=1,9,1 do
     turtle.select(i)
 	if turtle.getItemCount(i) > 0 then
 	  turtle.drop()
 	end
   end
   turtle.select(1)
 end
 
 function moveToOrigin()
   moveTo(origin[1],location[3])
   moveTo(origin[1],origin[3])
 end
 
 function turnToX(x)
   if location[1] < x then
     turnOriginRight()
   elseif location[1] > x then
     turnOriginLeft()
   end
 end
 
 function turnToZ(z)
   if location[3] < z then
     turnOriginUp()
   elseif location[3] > z then
     turnOriginDown()
   end
 end
 
 function moveTo(x,z)
   turnToX(x)
   while location[1] ~= x do
     forward()
 	sleep(0)
   end
   turnToZ(z)
   while location[3]~=z do
     forward()
 	sleep(0)
   end
 end
 
 for x=1,max[1],1 do
   for z=1,max[3],1 do
     if x ~= 1 and z == 1 then
 	else
     --print(tostring(x).."/"..tostring(z).."  /// " .. tostring(location[1]) .. "/"..tostring(location[2]).."/"..tostring(location[3]))
 
     digForward()
 	digDown()
 	if checkInventory() then
 	  doDropOff(true)
 	end
 	end
   end
   if x < max[1] then
 	turnOriginLeft()
 	digForward()
 	digDown()
 	if x % 2 == 1 then
 		turnOriginDown()
 	else
 		turnOriginUp()
 	end
   end
   --turnOriginDown()
   --digBack()
 end
 
 doDropOff(false)