I added 5 degrees to the angle to allow my ERCF mounted cutter to clear my top hat while being mounted on the side. The ideas is that I want a short and relatively straigh filament path from ERCF to my Triedent toolhead, without looping around through the back entrance. The entrance will be in the top panel in the center. I added the top hat to give the trident toolhead extra clearance since the PTFU will be in the center.

Alternatively, this could be mounted lower, and put the PTFE port in the side of the tophat, which would mimic the rear entry except being on the side. Not sure how it would work with printhead movement.

This is all testing, and will likely change.