I have it working with a BTT Microprobe (which is very similar to CR-touch). It does not work with the PRTouch which comes with the printer (and is inferior anyway). Eddy is probably much better than either of those. I have the gantry mode printed and pre-assembled but decided not to go with it. Maybe someday if something breaks and I’ll have to tear printer apart anyway. When you’re saying extruder you mean the hotend?