M3 nut plug sets!
Since the M3 nut size is not included in the standard plug sets (5,5 ), I made my own holder for it! 
Since these nuts are not tightened with much force, based on my experience so far, the nut does not rotate in the printed part! 
Both normal and self-locking nuts can be inserted!

Recommended PETG filament due to its strength!
If you downloaded it, please give it a like!

The box in the photo can be downloaded here:
[https://makerworld.com/en/models/1751503-stackable-sliding-storage-box](https://makerworld.com/en/models/1751503-stackable-sliding-storage-box)