Creality CR-10s Pro Filament Feeder with retract stoppers

thingiverse

I found this rad 'Thing' and read the comments saying that the filament comes off when retracting... so to avoid this future headache, I thought I would add a few guides to keep the filament where it was supposed to stay (even when retracting) so it would stay on the guide. I used SketchUP to modify the file and export it (so of course there are some small faults and holes/gaps etc... but CURA still prints it OK without severe warnings. I didn't measure the bearing used, so I can't talk about the bearing purchase/procurement. I just had a few bearings laying about but I'm sure its pretty generic in shape, size and availability.