Man I am sick of searching with no results. Maybe you can point me into the right direction: what was that fully-printed planetary-like extruder which was guiding the filament around a central gear by virtue of friction between the filament and the myriad of small gears scattered around the central hub? I can’t for my life remember it’s name or anything relevant apparently that would bring it up in searches.
I’d forgotten a key factor in the design I believe you seek. Just sheer luck that I found the right terminology in the link as well:
Belt drive!
Nope, not this one, it was some sort of reprap extruder with the filament going in and friction-driven around by small plastic gears all the way around the central hub and it didn’t use any toothed pulley… man my head spins of so many searches with no result…
This one?
or this one?
Sounds like this https://www.youtube.com/watch?v=QhXjevOY_uk but no idea how to drive this to extrude filaments
Saintflint?
Unfortunately neither one. It was a very strange thing, the filament would enter somewhere between the center gear and a small driver gear and it would go around that center hub forced by many small printed gears until it would exit about in the same place as it entered. It was very experimental and all those little gears were kept in place with aluminum rivets… man I feel bad about sending you searching 
Finally found it, explaining about it made me come up with the proper set of keywords that brought it up in the search I believe the aluminum rivets were a part of that winner words combo. It is this one: https://www.thingiverse.com/thing:1212687
Thanks all.
I looked at their YouTube channel, while they show it pushing plastic out a hot end for a few seconds, they never show it printing. I wonder how it holds up to retractions, esp. long retractions needed for Bowden systems.