Summary T-handle for a 1.5mm hex wrench which happens to be the one that comes with a Mono Price Maker Select Mini printer. Place hex wrench in vise and tap, tap, STOP on the handle. If you tap too far it will split the handle. I've done that twice now, third times a charm. :D My settings were; 0.0875 layer, 40% 50mm/s UPDATE 2-7-17 I stated it was for a 2mm hex wrench, in fact it appears to be 1.5mm.