Compatible with all printers to protect the extruder cable and make it more stiff. Simply slide it over the extruder PCB from the front and use a zip-tie to tighten all the cables at the strain relief neck.
This is the newest renditions, both extending the neck higher and having an impression for the zip-tie. The latter has a thru-hole for 3mm tubing that can be put between the extruder and your filament roll.
As with all our printer parts these are precision parts. For best results it is highly recommended that you use calibrated filament using the method found here: https://www.thingiverse.com/thing:1037301