I needed to come up with a retainer for the general purpose open camera mount provided with my camera to prevent the camera from falling out on rough roads. I've dropped a camera twice before, lost a camera the second time! The solution I came up with slides over the raised brass insert housing on the bottom of the mount, and is secured with a M6 bolt. I went with a nylon 1/4-20 x 1/2" bolt (couldn't find one shorter locally) and two thick nylon washers as spacers. (The longer than needed bolt may come in handy should I decide to add a feature to the mount later on.)
The best orientation in the slicer is for the bottom of the retainer to be placed on the bed. In Cura I suggest using Tree Support. A brim or raft is also recommended.
Resolution: 0.20 mm Walls: 2 Infill: 15%+, Gyroid Support: Yes, Tree support recommended Raft: Your choice Brim: Your choice Filament: PETG, ASA, ABS