Two-Tau Multi-Pi Rack

This is a modular rack system to hold four Raspberry Pi 3s along with a network switch, USB power hub, and a fan. Builds as a set of modules, which clip together to form a full system.

The devices I used are:
* Netgear ProSAFE 5-port gigabit switch - UK part number GS105UK
* RAVPower 60W mains charger - UK part number UK RP-PC028(B)
* USB 5V-powered 80mm x 80mm x 25mm fan (sourced through Ebay)

and of course a bunch of Raspberry Pis!

To avoid excessive height, I used a right-angled figure-8 power connector for the USB power block.

BTW the video in the gallery is one of [Vi Hart](https://www.youtube.com/channel/UCOGeU-1Fig3rrDjhm9Zs_wg)'s excellent explanations why Tau is better than Pi. Go follow her!