The first of it's kind. With every hit it deals on its opponent the recoils destroys its drive motors a little bit more. Center of gravity was too far away from its wheels. Frame was solid otherwise, and the weapon motor was resilient. Though spare drive motors it was able to get second place at Dragoncon 2013
Fixed all the things that were wrong with Stability Margins. Survived nine rounds through the loser's bracket at Motorama 2014 and beat the eventual champion once to land second place. Still has a couple problems with structural toughness due to its thinness.
It was designed around an axial flux weapon motor for flatness. Didn't do so hot because it got really hot (from current draw because of inefficiency) and browned out the electronics. But it did spin and hit things, so that was pretty cool. It competed in Dragoncon 2014 and Combots Cup 2014.
Back to radial flux motors. I was tired of cracking motor magnets. So I purposely chose a shock absorbing material to spare the drive motors at the expense of hitting a little less hard. Survivability comes first. The result is In the Margins. It competed in Motorama 2015.
Margin of Safety
Margin of Safety was a compromise between the plastic deformation of the plastic around the weapon in In the Margins which caused it to lose, and keeping the drive motors isolated from shock. Thus, it has a metal weapon holder and a plastic frame. It also used brushless drive motors, which work okay.