Case for qtpy_synth CircuitPython synthesizer

The qtpy_synth pcb was originally designed to be held up by four M2.5 standoffs and screws, but I wanted a simple little case that was easy to snap on and off.  This case has two tabs that will hold the qtpy_synth PCB well enough but allow you to pull it out without much effort.  If you want a more secure attachment, you can still use M2.5 screws and nuts.

Also included is an "OLED standoff brace" that you can optionally print to help hold up the OLED display.

The 3d printed knobs are from: https://www.thingiverse.com/thing:5759656