Knob for control panel on a MEP-002A or MEP-003A generator.I am printed it upside down on a raft. The small outside overhang did not seem to be a problem. If you want to print it right side up, just remove the top-level rotate() near the top of the scad file. Keep the metal center out of the old knob, press it small end first into this knob such that the set screw holes line up. NOTE: It does NOT go all the way to the bottom of the hole. That is how the original was. Just press it in until the screw holes line up and stop. Have fun Terry Use longer set screws, so they engage the plastic also.