What sets PP apart from companies making similar machines is their commitment to open source hardware. They make some machines themselves and sell them but their main focus has always been the open source blueprints that (in theory) any one can use to make these machines at home

Lots of cross over with Open Source Ecology's Global Village Construction kit[0] where they attempted to create open source versions of 50 technologies they considered critical for civilization. They made a brick press and a tractor but I think progress slowed after that

[0] https://www.opensourceecology.org/gvcs/