My filament enters the lack enclosure from the side which means there is a chance the filament will get snagged on the z screw during prints. I downloaded a few filament guides from Thingiverse but none fitted my Prusa i3 Mk3s, even with double sided tape (I don't want to superglue anything to my beautiful printer), so I quickly modeled this one. It isn't a complicated design, but meets the need and fits the printer nicely.
This isn't a challenging print, you can print it as you see fit.
the settings I used were:
0.2 layer height
15% infill
No brim
No skirt
I printed it in PETG
The author hasn't provided the model origin yet.