Summary This Effector for a column delta printer, like the MOST delta RepRap allows different hotend nozzle sizes to be used. It does this without The effects of localized heating or the unused nozzles colliding with the part due to warping or bed-leveling issues and helps reduce the effect of nozzle drool/ooze. This design needs new no firmware or other hardware feedback sensors -- so it is an easy upgrade to perform for those who do not want to modify their firmware. Please note: the center to center distance of the carriage joints must be the same as the effectors otherwise the effector will not move across the bed in a plane. Please ask questions as I don't know what information is missing for others to reproduce this. Instructions Please visit the following website for more information http://www.appropedia.org/Auto-Clearance_Adjustable_Triple_Hotend_Effector The key to this design that can be adapted to any other hot end is that the hotend is held by the 0.015 of an inch spring in which the z height is controlled by the two grub screws that act as stops. the spring was cut with tin scissors although it would have been much easier with punches.