18650 Capacity Tester Case

This is remix of 18650 [Capacity Tester Housing](https://www.thingiverse.com/thing:6123838).

**Changes**:
- improved case details
- shorter buttons
- removed 4 external terminals
- added 4 led holes with light diffusers

**BoM**:
- 4x M3x18
- 10cm of transparent PETG 1.75mm for light diffusers


Print the case and 4 buttons. Drill hole for light diffusers with 1.7mm drill bit. Cut four 7 mm pieces of 1.75 mm transparent PETG. Push PETG pieces into drilled holes.


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