ordbot rumba mount plus fan

This provides all the mounting holes for the reprapdiscount "rumba" electronics board onto the ordbot hadron handle plate.

Note, I just published version7 (untested) They are intended to address the problems with the prior release (as follows) I have a have a few changes i want to make. I'm using this first version but it needs fixes...

1. The board mounting posts need to be about 1mm taller. I used some shim washers as a temporary fix. If you don't mind the nut-posts touching the component solder side wires (Don't use those holes) you can live with it as is. or use shim washers like I did.

2. The noles in the fan mount are too large. I intended them to self tap with m3 screws, but I ended up using longer screws and nuts to mount the fan to the thing. I also shimmed the 2 holes that hold the thing agains the panel with scrap extrustion string to...

But I haven't gotten around to cleaning them up yet, and have had requests, so here they are as is....

(i just added some shim washers in case you don't have any handy)