It's really annoying to pick out the supports in the nooks and crannies of other Garmin Mount designs so I remixed @justsean's simplified mount with some slight tweeks to allow it to be printed upside down with no supports. You have to push in hard to seat it in because there's no shallow relief for the locking tabs, but it works OK in everything I tried. I attached the mount to a socket that fit the core of the mount on my 530 with broken off ears. All good now.
Fusion 360 source included.
Garmin_830_Mount_Repair_v5.f3d | 163.6KB | |
MaleMount.stl | 70.6KB |