The bottom end of Wouxun KG-UV3D battery packs have an intricate set of lugs and ramps:
Wouxun KG-UV3D - battery base
Those features mate with this set of holes and planes on the bottom of the radio:
Wouxun KB-UV3D - base features
Which requires making something like this:
HT-GPS Case - base plate
Which attaches to the base of the GPS+Voice case:
HT-GPS Adapter Case - Base view
Which came out quite nicely:
HT-GPS Case - base plate
The trick is to extrude a chunk of the main case shape, then subtract this angular doodad:
HT-GPS Case - radio base shape
Then slice off the angular parts to suit (the purple objects represent volumes that will be subtracted from the gray part):
HT-GPS Case - base plate - construction
Most of the heavy lifting happened with that version, but this one fits better…
