Summary

This thing is obsolete.
The new version is much, much better.
Go here:
https://www.thingiverse.com/thing:2825623

How I Designed This

Based upon examining several battery covers and adding parameters for the features they all had in common. Note: this will never work for curved-back devices, though you'd be surprised how many things are flat where the battery compartment is.

This was one of my earlier customizable things so I made a lot of mistakes and some things do not adjust properly. As time permits I am doing some cleanup of the code to fix this.

Battery Cover Creator (Customizable)

This thing is obsolete.The new version is much, much better.Go here:https://www.thingiverse.com/thing:2825623

This thing is obsolete.
The new version is much, much better.
Go here:
https://www.thingiverse.com/thing:2825623