Recycle

local function suck()
    repeat
    os.sleep(.5)
    until turtle.suckUp(1)
end

local function fillCraft()
  for i=1,3 do
    turtle.select(i)
    suck()
  end
  for i=5,7 do
    turtle.select(i)
    suck()
  end
  for i=9,11 do
    turtle.select(i)
    suck()
  end
end

while true do
  fillCraft()
  turtle.craft()
  turtle.dropDown()
end