M-Robotix-M-Capsela adapter

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/jlHfX7bb6UC

It is a minor edit of my second attempt : http://www.thingiverse.com/thing:1035951
I added a torus ring to the center to make a stop bump.

the reason this is neccessary is that Robotix connectors are 13mm across, and Capsella are 13.5mm across. It is just enough clearance that the pieces will fall apart at the first opportunity.