Smith and Wesson J Frame Pocket Carry Holster.

thingiverse

This is a compact carry case for any J frame revolver. I've put it through its paces on a Model 60, 642, and 638. It's designed to fit snugly, staying securely in place when you draw the gun. Apart from reloading, the action works flawlessly without any interference from the holster. A gap at the top allows for the forcing cone to vent properly; be mindful of this if you modify it, as blocking gas release while firing could cause the holster to break and send fragments of plastic flying everywhere. So, just don't do that. Printed with five perimeters, 3D honeycomb infill at 40%.