Vein Miner Placer

local tArgs = {...}
length = tArgs[1] or 4
width = tArgs[2] or 4
height = tArgs[3] or 4

term.clear()
term.setCursorPos(1, 1)
print("Generating cube...")
print("Upon completion, terminate to stop.")

function getItem()
for h = 1, 16 do
turtle.select(h)
if turtle.getItemCount() > 0 then
if h == 16 then
error("no items")
end
break
end
end
end

while true do

turtle.select(16)
turtle.refuel();
getItem()
for l = 1, height do

turtle.up()
for n = 1, width/2 do
turtle.placeDown()
for i = 1, length-1 do
  turtle.forward()
  turtle.placeDown()
end

turtle.turnLeft()
turtle.forward()
turtle.turnLeft()

turtle.placeDown();
for i = 1, length-1 do
  turtle.forward()
  turtle.placeDown()
end

if n < width/2 then
turtle.turnRight()
turtle.forward()
turtle.turnRight()
end

end

--turtle.turnLeft()
--turtle.turnLeft()
--for i = 1, length-1 do
--  turtle.forward()
--end
turtle.turnLeft()
for i = 1, length-1 do
  turtle.forward()
end
turtle.turnLeft()
end
while not turtle.down() do end
sleep(3)
for v = 1, height-1 do
turtle.down()
end
end