About this 3D model

Intended for modeling. Spacexula's nema 17 variation. This one has negative holes where the pins are. they go all the way through. 4mm version is friendly to 3mm fillament, it goes in without complaint. (first) 3mm version probably fits mounting screws properly, or at least well enough to hold. (second) pictured is 4mm with 3mm filament in it, intended for modeling, and i'm not going to use screws. The center is still a bit large, I will add a replaceable insert for the motor so the attached gear rotates right, in the mean time, if you use a long strip, the bend of the filament alone will hold it in place.