This plate is a duplicate of the one that comes with the newer Printrbots with the holes for the Al extruder. However, it has a slot in it for the J-head lite instead of the Ubis hole. You may have to fiddle with the size of "box" and "bolt" in the source depending on how accurate your printer makes holes. This would be a good starting point if you need to make a similar adapter for another head.You may want to adjust box and bolt to account for your printer's ability to make accurate holes. While you are testing, go to the very bottom and take the comments (//) off of these lines: //difference() { main(); // translate([-1,-1,.6]) cube([100,100,100]); //} This will let you print just a thin test sheet. Or if you take the comment off the projection line, you can export to DXF and print to see if everything lines up well.