Wahoo to SP Connect adapter

You should print vertically with supports. Try to avoid support under the lower Garmin hook.

PETG seems to be tough enough, but I printed it in ASA CF.

I rotated the Garmin interface by 90° and optimized the strength and fitting.

I definitely recommend 100% infill and printing PETG or strong filament. 

I assume no guarantee for possible damage to your smartphones