Thank you very much for the design.
I only printed them so they would fit with the other orange parts I've installed on my bike.
However, I tried both versions: the one with your predesigned support and the one without, letting PrusaSlicer create the support. The latter turned out awesome. :)
I suppose the ones with the predesigned support did not work for me because I did not use your settings and printed with the following parameters:
- 0.4mm original MK4 nozzle
- 0.1mm layers
- PETG
- 100% infill
- auto support'pillars' facing the print plate (see screenshot)

Again, thank you very much! :) (edited)