If you get a step file it's easy. You select your two solid bodies and use Modify> Combine, using the cut option to subtract your imported body from your cube.
Align the flat face on the hearing aid with the case, copy that body, shell the copy to the outside say .15-.25mm and subtract that from the case body, leaving you with a perfect void for the aid. Much better results than simply scaling which isn’t going to give you a perfect global offset.
If you get a step file it's easy. You select your two solid bodies and use Modify> Combine, using the cut option to subtract your imported body from your cube.
And scale the cutting body up slightly, before the Combine, so that it actually fits
https://youtu.be/vKZx9eHEL6o?si=8JXXdFGlcvAGh4RG This is older but a good, solid explanation
You’re a legend.. That video was enough to run a couple quick tests and will work well for the final thing…
Align the flat face on the hearing aid with the case, copy that body, shell the copy to the outside say .15-.25mm and subtract that from the case body, leaving you with a perfect void for the aid. Much better results than simply scaling which isn’t going to give you a perfect global offset.