This is an adapter for mounting to Prinsu type roof rack cross bars with 5/16 in by 2 in by 3in Square u-bolts available at Home Depot. Should fit most overloading roof rack designs using approximately 2 inch cross bar extrusions. This mount uses the screw supplied with the camera to attach it, so no extra hardware is necessary.
I may need to shorten the height of the mount to fit true 1 in by 2 in extrusions as I designed this to fit them metric 2040 extrusion on my setup which is 5mm smaller in both dimensions. This model could be shortened in the slicer by removing some of the bottom layers.
It's necessary to print this in a strong, UV and heat resistant material like PC, ASA, or maybe PETG. Supports are only needed for the inner screwdriver access hole, so use paint on supports. The outer overhangs are steep enough to not need support.
The author marked this model as their own original creation.