HeaterMeter v4.3 Customizable Case

The official boxy case for [HeaterMeter v4.3 BBQ grill controller](https://github.com/capnbry/heatermeter). Print your own!

This is customizable case holds a HeaterMeter and Raspberry Pi. Tested with B+ and Pi 3, but should fit A+, B+, Pi 2, Pi 3B, Pi 3A, and Pi Zero. NOT Pi 4. It often takes less time to smoke a butt than it does for the Thingiverse Customizer to generate a custom case, so here's instructions on rendering on your own machine which takes about a minute:
* Download the scad file from Thing Files
* Download OpenSCAD from [openscad.org](https://www.openscad.org/downloads.html)
* Open the scad file, and make sure View -> Hide customizer is **not** Checked
* Select the options you want, then hit "Render" from the main toolbar (hotkey: F6)
* When it finishes, Export as STL (hotkey: F7). The model may need to be repaired as some of the combinations of options can create degenerate faces in the exported model.

Updated:
* 2021-Sep-08
* Added MJ1-2503A option for