Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5881623.

Here's a base model of most generic lightsaber hilts. I use this to turn solid lightsabers models into casing for my cheap hilts. Just import the files you want to modify into microsoft 3d builder move this part till its fits inside it and subtract this from it. It has extruded button/charger spaces and extruded cylanders for speaker and blade holes.