Self-lubricating 3D printable materials for space
Well, I think this depends on your machine.  If you can support extrusion temps north of 350C and bed temps ~150C, you could try PEI:

https://www.3dxtech.com/ultem-9085-3d-printing-filament/

I believe PEI has self-lubricating properties, and has outgassing of ~0.40% TML (PET is ~0.43%).  Of course, most off-the-shelf printers don't handle that sort of temp range.  But then, industrial grade materials are likely to require industrial grade machines.  :)

You could compare other DBs to NASA's as well.

Outgassing DB:  http://esmat.esa.int/materialframe.html

By the way, Nylon has an outgassing aspect >2.0% TML, which is definitely on the high side for vacuum applications.