Pi Zero Node - Friction Fit

A nice, compact Pi Zero node case! Inspired by [blankdesign's node case](https://www.thingiverse.com/thing:2841417), this case is entirely friction fit and uses the flexibility of PLA to keep components in place. The USB charging slot will need to be adjusted if you use a small TP4056, but I also included the STEP file so it should not be difficult.

Components list:
Pi Zero / Pi Zero W
18650 Li-On Cell
[SPDT Switch](https://www.amazon.com/gp/product/B007QAJST6/)
[TP4056 Li-Ion Charger](ht