This was designed specifically for the Printrbot Simple 2014, but should work with any Printrbot (or any 3D printer for that matter) that has plywood 6.25mm thick.
Quick Printing Tip
Each of the objects will need to be rotated 90° on the Y axis and centered to print correctly. (I also rotate 90° on the X axis because the prints seem to come out a little better when the build platform is doing most of the moving instead of the Y axis.)
You will need to print whichever file you choose 4 times for a complete set of Feet Stabilizers.
Now back to the show...
I was looking around and saw there were no foot stabilizers to my liking, so I used AutoDesk 123D Design to design the part.
I was inspired by the shape of http://www.thingiverse.com/thing:95459 and how it fits around the wood.
So I took a few measurements and drew it up in 123D Design.
The first version (V1) was the most basic just based on measurements.
V2 removes a good portion of "dead space" to save on time and filament and also creates a bit of springiness to dampen vibration and helps keep the printer from rocking (like a bar stool with 1 short leg)
V3 has not been printed / tested yet, but the thought behind its design was to further stabilize the "wobbly bar stool" scenario. I also believe it will help with X axis stabilization of the whole printer as each of the V2 feet act like a set of (2) V3 feet.
Please feel free to edit the file or let me know if there is a way to improve the design.