This is an adapter for using new J-Head Mk V-B hotend in the printrbot v2. Due to this hotend is smaller than others, the X-carriage hits the bed. I made this derivative for lower the pb-Xtruder-Mount-v2 and print correctly with the hotend. NOTE: This piece may be helpful for using with another small hotend, but I can't test it.Print this piece if you have a small hotend. This piece will be inserted between the pb-Xtruder-Mount-v2 and the pb-X-Carriage-v2, both official parts of the Printrbot.You need three M4 bolts and three nuts. Two bolts should be 40mm long and the other 15 or 20mm long.