I've desgined this internal part of a Schuko plug, to relief the tension that pulls the Powercord out of the connectors.
This is as sparepart and shoould fit for most cables.

PLEASE do NOT print this in PLA, because of the bad layer adhesion. For this critical part i highly recommend NYLON or ABS polymers.

Prusa

I3 MK3S

No

No

0.15