This is a modification of: https://www.youmagine.com/designs/ulitimaker-orig-modular-printhead-merlin-ubis It can be used to make the UMO head stock also with: https://www.youmagine.com/designs/modular-print-head-addon-for-umo-stock-hot-end Or can be used with E3D V6 with: https://www.youmagine.com/designs/foehnsturms-modular-printhead-e3dv6-adapter This includes a 13mm bore to be used with a 12mm P.I.N.D.A. probe like: http://www.ebay.it/itm/122206045078?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT This can then be used for auto bed leveling purposes by modifying Marlin accordingly. I'm still working on the firmware part as of now :) Edit1: moved slightly the hole for the pinda probe to better avoid x/y axes interferences Edit2: added a new version for a more compact design which allows the pinda sensor to reach lower on the bed.