For my Carbonoid D1 printer I derived the design of the end effector from the work I did for the OpenBeam Kossel Pro. This end effector is designed for the E3D Volcano hotend. For the 1.75 mm and 3 mm versions you only have to print a different holder clip. The end effector base also has a 18 mm hole for an inductive bed sensor.The E3D V6 is also supported, just print and use the fan ducts for the V6. Update 04-18-2016: Added a E3D V6 version of the end effector base that supports a SN04-N inductive bed sensor.