View difference between Paste ID: jRRNRecK and ZRYASCa9

 -- 1 - glass
 -- 2 - black
 -- 3 - red
 Slots = {
    {
 	{2, 3, 3, 2},
     {3, 0, 0, 3},
     {3, 0, 0, 3},
     {2, 3, 3, 2}
    },
     {
      {3, 0, 0, 3},
      {0, 0, 0, 0},
      {0, 0, 0, 0},
      {3, 0, 0, 3}
    }
 }
 for layer = 1, #Slots do
     for line = 1, #Slots[layer] do
         for elem = 1, #Slots[layer][line] do
-          slot = Slots[line][elem]
+          slot = Slots[layer][line][elem]
           if slot ~= 0 then
             turtle.select(slot)
             turtle.placeDown()
           end
-         turtle.forward()
+          turtle.forward()
         end
-        for turt = 1, #Slots[line] do
+        for turt = 1, #Slots[layer][line] do
           turtle.back()
         end
-        turtle.up()
+        turtle.turnRight()
         turtle.forward()
         turtle.turnLeft()
-    turtle.forward()
+
     turtle.turnLeft()
-    for turt = 1, #Slots do
+	for line = 1, #Slots[layer] do
-      turtle.down()
+        turtle.forward()
     end
     turtle.turnRight()
     turtle.up()
 end