Power supply cover - improved version 2

This is an improved version of my earlier [power supply cover using Molex connectors](http://www.thingiverse.com/thing:182462). As most has remained the same, I only dwell on the improvements relative to the initial version:


- An *air flow grid* on the lower front side allows for better ventilation.
- The Molex connector can now be secured with *clips* so that they don't have to be glued in.
- A new cut-out is provided for the *voltage adjustment trimpot*.



Given that we already have the digital voltmeter to show the exact voltage, I though that it would be neat if I could also fine-tune the voltage directly without removing the cover. For this I unsoldered the 1k trimpot from the power supply PCB and replaced it by a 2-pin header. I then mounted the trimpot onto a little peace of prototype PCB and glued it to the new cut-out to the right of the voltage display. _However this kind of modding implies opening up the power supply, which voids your