-- 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[layer][line][elem]
          if slot ~= 0 then
            turtle.select(slot)
            turtle.placeDown()
          end
          turtle.forward()
        end
        for turt = 1, #Slots[layer][line] do
          turtle.back()
        end
        turtle.turnRight()
        turtle.forward()
        turtle.turnLeft()
    end
    turtle.turnLeft()
    for line = 1, #Slots[layer] do
        turtle.forward()
    end
    turtle.turnRight()
    turtle.up()
end