18650 Multi-Purpose Housing - 2 Cell version

Seems like every 18650 holder / housing / case i've come across on Thingiverse didn't quite fit the bill. Some where for niche applications, some were not meant to be used for anything beyond storage, and some didn't seem to allocate the extra space for contacts.

So, i popped into fusion360, and this is the end result.

It's a 2-cell holder with the following features:
- mounting holes, spaced 20mm from either end, and 9.75mm from center spine
- Cavities for contacts on either end
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