This is a reference model that I made in an hour for the Nothing Ear (a) case. It is not perfectly accurate, as I don't have the tools for that. I only have a dial caliper that reads imperial on the dial and my phone camera. I hope it works for anyone that needs it, and give it a little bit of tolerence just in case. I'll probably send out the F3D file if I remember. 

7/12/2024 Update: Better dimensional accuracy, confirmed by a test print. 

10/28/2026 Update: Added a .STEP file, a bit late.