The paper pulp for the microfactory will be quite thin and dilluted, but it can still be a challenge to pump it to where it needs to be. Since as much as possible will be open source, the pumps will also be mostly 3D-printed.

At first I tried a sorts of archimedes screw which in my head seemed like a great idea, but when printed and tried it was awful. So some research showed that paper mills use slurry or impeller pumps. So back to the digital drawing board, and soon the new prototype is ready for trial.