Robo 3d Riser (remix)

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