When I first got my Robo 3D R1+, one of the first things I printed out were the Riser feet designed by WheresWaldo (http://www.thingiverse.com/thing:868246) to help increase airflow and cooling of the Arduino components located at the bottom of the printer since this was recommended by many Robo 3d users.

The Robo 3D came with 4 rubber L-shaped feet that slipped onto the bottom frame of the machine to prevent slipping. When I installed the risers, the rubber feet were useless. Unfortunately, my newly printed risers were flat and smooth on the bottom surface and did not provide traction or stability for the printer. As a quick solution, I used a few small squares of rubber shelf liners for grip.

I thought it was a waste to not utilize those L-shaped rubber feet, so I redesigned the Robo Riser and added some channels on the bottom for the rubber feet to pressure fit into. Now, the Robo 3D has it's risers for improved air flow and also better table traction!