View difference between Paste ID: LqP4t1jA and xw45DNzy

 local length = 61
 local width = 61
 
 local function refuel()
 	if turtle.getFuelLevel() < 50 then
 		local prev = turtle.getSelectedSlot()
 		turtle.select(1)
 		if not turtle.refuel(4) then
 			print('Need more fuel')
 			while not turtle.refuel(4) do
 				sleep(3)
 			end
 		end
 		turtle.select(prev)
 	end
 end
 
 local function tryForwards()
 	refuel()
 	while not turtle.forward() do
 		if turtle.detect() then
 			turtle.dig()
 			sleep(.5)
 			while turtle.detect() do
 				turtle.dig()
 				sleep(.5)
 			end
 		elseif turtle.attack() then
 		else
 			sleep(1)
 		end
 	end
 end
 
-local function advance()
+
-	if turtle.getSelectedSlot() == 16 then
+
-		print('Need more materials')
+
-		local empty = true
+
-		while empty do
+
-			for n=2, 16 do
+
-                print (n)
+
-                if turtle.getItemCount(n) > 0 then
+
-                    empty = false
+
-                    turtle.select(n)
+
-                    return
+
-                end
+
-            end
+
-			sleep(3)
+for i = 1, length-1, 1 do
 	for j = 1, width-1, 1 do
 		refuel()
-		turtle.select(turtle.getSelectedSlot() + 1)
+
 	end
-end
+
 end