Two-part GoPro to Garmin Adapter
thingiverse
This adapter prints in two parts to ensure the detail on each end. I couldn't find a decent GoPro to Garmin mount that had a positive locking action so I made the grooves a bit bigger and deeper. The two halves can be put together with small screws or glue (or both, using the screws to clamp the parts while the glue sets). A pair of M2.5 bolts @ 8mm long and nuts should do it. I print this in PETG with 100% infill for a rugged piece.
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