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?
Shredder cannot directly output items to pipes
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. ^^