Magnetic base and/or smallish tabletop stand for GoPro. Domed the underside of the void to minimize necessary post processing due to stringing, and to give additional volume for excess epoxy when installing magnets.
Update: The domed underside kinda sucked. now it's a cone, much better on reducing stringing. Also adjusted the diameter of the magnet hole, as the magnets i received were slightly oversized.
May need post processing under sharp overhangs in the middle of the domed void where the magnets are to be installed or underneath the overhangs of the clip outriggers. I printed mine on a raft mostly because i'm lazy and can't level a bed worth a crap, but it shouldn't be necessary.
Ripped off design of uprights and middle guide from here then cobbled together my own magnet cup for the bottom portion. Will be using magnets purchased from Amazon, stacking the magnets two high and inserting them into the convenient magnet shaped void with plenty of epoxy.