“Casino chip” design on bearings to help seeing filament progress and retraction on #saintflint (Sorry for the poor light condition). Soon available at the nearest 3D printer near you. Stupid simple and a bit more good looking than the nail varnish from my daughter (don’t tell her). Before you ask, yes that’s an Onshape logo I am printing. Fooling around for Lisbon Maker Faire 2015. 
#makerfairelisbon
#saintflint #onshape
Didn’t come out too bad for a first attempt
@Alex_Skoruppa Slightly improving airflow efficiency in theory (not sure if it does). Like the look anyway…
@shauki Yes sir. Trying to win the Model Of The Week contest on Onshape
Easy… Extrude, Copy and Rotate 90 and Boolean Intersect. You just have to do some manual work where material can miss sometimes.
is this extruder compatible with mk7 or mk8 drive wheel?
Thank you!
@Kristijan_kolak Sure enough, the MK8 version is here:
There is also a MK7 version around, but I would recommended sticking with the more powerful MK8 (smaller diameter with same torque => bigger force).
Hey, @Michael_Memeteau , I printed an MK7 version of #Saintflint and ran into some clearance issues. I’m thinking the inside surface where the threads are is too thick to permit good contact with the teeth of the drive gear. I’ll lean them up against a belt sander and see if a little ‘clearancing’ can improve things.
I dunno if it’s the model or the material I printed…my first extruders were in PETG and this last one was in ABS.
FWIW, the Steel gear started slipping after a couple months use…so there’s some anecdotal evidence for the group. Hardened steel gears wear too. 
Hi Mike! When printing in ABS it’s usually a good practice to account for the 2% of length reduction (so, multiply all the dimension in your slicer by 102% if you want to land on your feet, especially if it has to fit something that wasn’t printed in ABS, like your stepper motor).
Still on my original coil, no sign of wear whatsoever… Which model did chose for printing (there is so many variation out there, I’m a little bit lost!).
I guess I’ve never had to print ABS where dimensionality was important…wouldn’t that make the fitment WORSE? (The two pieces can’t come close enough together to press the skate bearings against the MK7 Gear)…and now that you mention it, It looks like I printed the MK7 gear version…tolerances sure are tight in this design…but I’ll admit, when it works, the loads are SIGNIFICANTLY less than any of the other pinch-wheel designs I’ve attempted (Wades, etc.)
I used the 11mm version posted earlier in this thread.
Btw, I “leaned” one side up against the belt sander. That provided all the clearance I needed.