M-Robotix-M-Capsela adapter

thingiverse

I made it with Tinkercad, you can edit it online at https://www.tinkercad.com/things/jlHfX7bb6UC. I modified my second try which can be seen here http://www.thingiverse.com/thing:1035951 and added a torus ring to the center for a stop bump. This was necessary because Robotix connectors are 13mm wide, while Capsella connectors measure 13.5mm in width. That tight clearance will inevitably cause the parts to come apart at the slightest opportunity.