My acrylic insulator retainer broke when I tried to tighten the screws on it too much. My thermal insulator was a bit wobbly...So I looked for a thing to print to replace it, but all I found was this http://www.thingiverse.com/thing:1004 it should work just the same, but I thought I would update to the newest version (the non-round version)-Download the STL -Slice it (I recommend fill rate higher than 0.5 for strength and at least 2 extra shells on every layer for the holes) -Print it -Use as is or drill out the holes for the M3 bolts with a 3mm drill to make things smoother. Chances are these holes have shrunk, unless you have "stretch" down to an art. -Print a few spares (for yourself and your buddies) because it's highly likely that this part is the first to go on most extruders.