Corner mounts for the 4 corners of the basalt bed to keep it from sliding around on the aluminum Z frame.These have been printed in polycarbonate plastic which tolerates the heat of the bed. There are 2 files. "Front" and "Back" files correlate to the position of the bed. Since the Z frame slumps in the back, I modified the amount of lift to remove the amount of lift required from the screw. Print the way they are oriented in the files. Use support. In skeinforge set the support flow rate to .9, and the extrusion gap width to 1.4 (this will space the support out -- important with PC, as it's super strong and support can be hard to remove w/o the additional spacing.) Once printed, remove the support and clean up. The mounts will snap into the engraved hole. Use an M3 screw to lock the mount in place.