Duil Cups with wire stress relief and gap

I wanted to use pre-assembled drivers from my Koss Porta-Pros and didn't want to de-solder them to get the assembly in the Duli Cup. So I took a small gap out of the model. Then I made a similar shape as an guide/insert/relief to also keep the wire centered in the hole and not keep snagging on the gap in the Duli Cup.

The Duli Cup with Gap isn't anything special. The insert should be printed in flexible filament. It will squish and should mostly close the gap in the mode.