I am a big fan of printing with a 3/4" hex, and then pressing a section of 1/2" Hex ID 3/4" Hex OD aluminum tube. This way the load the printed part sees is on a 3/4" hex which will be much harder to round out. McMaster link for the tube.
And here is the link for my swerve design that has a lot of printed parts in it that Mark mentioned earlier.
I actually have a version of this module built up and sitting on my desk at work but haven’t posted it as it actually has more printed parts then it normally would, as I made it while stuck at home during quarantine so I wasn’t able to machine the bevel gears and plates like normal.
33 has a similar version of this module built up in an entire test chassis that can be seen here.
33 also ran a printed module during the 2018 competition season and can be seen here and here.
The 2018 version is doesn’t really compare to where the design is at now, so I wouldn’t really recommend using that version or basing a ton off of it, the newer versions are much better.
As Mark said, the versions we have made lately are all using Onyx filament on a Markforged Onyx One. The 2018 module was SLS printed with Nylon, and was ordered through Shapeways.com