I work at a camp where I help teach a 3D printing class, and one of the projects we do is have them build a Printrbot simple that they get to keep. One of the big problems we kept having though is that when you ran the wires through they'd either be so thick that they'd lift the printer and cause it to rock uncontrollably or that they'd have to go in at some strange angle that made the printer tilt. So in order to remedy that I designed these little feet that'll raise the printer half an inch off the ground.
They can all fit on the Printrbot simple print bed, although you have to make sure the back leg is at a 45 degree angle since it's slightly longer than 4 inches. I printed two front legs and had them on both sides of the printer. You could use one front leg, but it does tend to wobble from side to side if you do. They're also tight enough that they should stay on even when you lift the printer.
I made them with 5% infill, 1mm shells, and .2mm resolution out of PLA. No rafts, no supports, just make sure they're positioned properly.