I needed a filament guide for a custom printer I built. I liked the one I was using on my Monoprice Maker Select v2 so I remixed it to use on 3030 extrusion.
Should already be in the right orientation for printing. No supports necessary.
I have included the OpenSCAD source for the remix.
I recommend putting a piece of PTFE tube in the inner ring for a nice smooth filament path (not shown in picture but I added one at a later date after taking the picture).
The author remixed this model. Imported from Thingiverse.