OBSOLETE: RUMBA controller board mount for 3DR Simple

## OBSOLETE

Use [thing:459777](http://www.thingiverse.com/thing:459777) instead.

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Print out two of these and you can then mount a [RUMBA](http://reprap.org/wiki/RUMBA) controller board to the underside of the top of your 3DR Simple, using the existing holes. You need four M3 screws and four M3 washers.