Knob

Printing:

Ring - Infil to add weight, supports needed for spade inset. Letter embossing doesn't need it.
Spade - Infil to add weight, no supports
Letters - Print flat, already scaled to fit nicely in the embossing
Star - Infil to add weight.

Full print with 4x4x4 walls/top/bottom and 38% infil came to about 48g in weight.

Probably hole is to small for an m3 bolt. it might need drilled bigger.