I did a mico-level clean-up of the model's geometry. There are no substantive changes to the design but it is more-ready for your own remixes.
The part printed an exact-fit for the BM16a with plate. It has no give or rattle on three axis, but the PCB+plate can be removed easily. OP zackinzanebyrd's measurements were perfection.
bm16a_macropad_closed_bottom_v2.stl | 6.1KB |