Summary

A short USB plug designed for alimentation.
It's designed for a 1mm diameter wire, but you can change the size in the Freecad file.
I printed it in PLA with 0.1mm layer height, and it's perfect.

Put the wire in the groove, and tin it in place, it will be sticked to the plate (can be seen in photos).

Warning: it's not designed to be plugged in/unplugged frequently.