This is a little bracket to allow you go mount your filament perpendicular to the frame to allow the extruder to always pull the same angle off the roll. It uses the metal holder that comes with the printer.
Printing parameters:
.2mm layer height
2-3 perimeters
20% infill
None of these are super important and you can switch to whatever you want
I also designed a lower friction roller that fits on it as well if you're interested
https://www.printables.com/model/391851-filament-roller-for-ender-3v2
The author marked this model as their own original creation.