Prusa Leveling Vertex

Holes and nut-traps in footed vertexes to accommodate screws for leveling.

3 flavors:
M8 & M4
5/16" & M4
5/16" & 6-32 *untested*

For the M4 variants, I'd recommend using M4 rosette thumb screws with the leveling cap screws: http://www.thingiverse.com/thing:5704.