They don’t move at all. Shredders are unclosed, even new-made, and pipes are empty and of-GT6. I must use a hopper to export it. Sorry for late informing because I forgot it for several months until I reset my house yesterday. Is that a bug?
Most likely you need bigger pipe. Try ultimet item pipes.
Though ofcourse other big Item Pipes work too, as long as they have enough Slots. ^^