P3Steel upper auxiliar electronics accesory

This is a support for any auxiliar electronics you may need for the P3Steel. It sits on top of the printer fixed by some M3 screws, nuts & washers. You can put there a on/off switch, some indicator leds, led Switches, potentiometers, small LCDs, fan controllers, etc. As anyone may need different components, I didn't make any holes in the panel. So you can make them manually, or if you prefer edit the freecad sources also included (remember to add support). The back guard is optional but may be c