RP3 20x20 extrusion case with cooling fan mount

Updated to add ribbon slot for PI camera 02/25/2019

Updated to add a top with header openings.

Remix of https://www.thingiverse.com/thing:2724200

To optimize adding a 3.3v-5v 30x30x7 cooling fan.
https://www.amazon.com/dp/B0792BW2VH/


To mount the case you will need

4 x M3x5 cap screws for mounting the Pi
4 x M3x16 cap screws for the cover
2 x M3x8 cap screws for the T-nuts
2 x M3 T-Nuts for 2020 profiles