Extruder Hotend Coupling - Wrench (Watch Scalling Informations)

I have some issues with my Ender, the fittings are garbage. I have replaced allready the one from the extruder Side, after the PTFE Tubing has moved approx 0.5 - 1 cm during retracting back and forth. After a half spool, the movement allready begins.

After I found a solution for the Hotend issue at "Filament Friday" / "Elproducts", I was very happy that today the counterpart for the extruder was set. Because the original STL and the other remixes all had faulty threads. The one from "bert_l