I took mediaman's excellent filament guide, trimmed most of it off, and rotated the stem, to fit on jwnicholson's cover. I simply glued it on using Gorilla super glue. I tried to come up with a way to integrate it into the cover but couldn't find a way that wouldn't require loads of support, so why not keep it simple.
UPDATE 11-17-2019:
I realized the .stl file I uploaded was not the final version. It was a bit asymmetrical.
Resolution: 0.1mm
Infill: 10%
Notes:
I recommend printing with 0.1mm resolution as the tolerance between ball inside and the outer component is small.
Post-Printing
When you glue it on, make sure you leave enough space so that the ball inside the guide can rotate freely.
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The author marked this model as their own original creation. Imported from Thingiverse.