This is a hotend cable coupler that is compatible with the listed push-fit adapter. It can be adapted to other hot end adapters.I use this on my Openbeam Rostock (Kossel).The default hole spacing is compatible with groovemount. If you're using these push-fit connectors, the attached SCAD and STL will work as is:amazon.com/gp/product/B004M8T2JG/ref=oh_details_o08_s00_i00Adjust couplingdiam for other push-fit adapters. If you tell me which one you use, I can generate STLs for them if you'd like.The default hole spacing is compatible with the Makergear Groovemount spacing. I use it on a Groovemount-compatible plate to hold my J-head hotend in.Instructions: