The part of my GPS mount that snaps onto the ball thingy broke, but it was a pretty easy fix with the RepRaster 5000 3D Printer. I started with this Parametric Ball Caster from Thingiverse, which I’ve used before. A quick measurement or two with the calipers to get the ball diameter and width of the caster.
I printed it in orange instead of black because I was too lazy to change the filament, and on the original mount I just ran a drill bit through what was left of the broken part to give me space to jam the new one in there… a bit of hot glue, and it’s not quite good as new, but it’ll work for now!