This is a paper-making machine, reduced to create a 10mm strip of paper pulp, rolls around and around and around to build up a three-dimension object. This is the extruder part.

Thought I'd lost these files, but found them on a USB, so I've put them up on https://www.myminifactory.com/object/46335. Still needs work, but if anyone wants to beat me to it, just go for it.

Reworked a bit to suit laser sintering printer: see https://www.myminifactory.com/object/47744