So the commodore 64 has this annoying location for the power connector, so I designed this shell for a random DIN connector. it has the cutouts for the inner part of the DIN that holds the DIN, and a 6mm hole for the power cable.

I tried printing it standing up, it looks very nice but the surfaces where you need to apply glue come out rounded.

Printing it horizontally makes nicer contact surfaces but it doesn't come out as round as it's supposed to be.

You'll need to experiment.