My son needs braces the upcoming period and, to my surprise, I didn't find any good dental retainer boxes with an insert which could be printed. Therefore I designed this box. It contains:

• The cylinder + the lid itself. The lid can be screwed onto the cylinder. I didn't try it, but I expect it will not be waterproof. However, it does close tightly.
• A separate insert with holes to allow water to get out, which allows for quick and easy cleaning

I also created a dental retainer box, with a loose lid on top of it. You can find it here:
https://makerworld.com/en/models/508022#profileId-423786

The plate is set up in such a manner, that it first prints the white insert fully, follow by the green cylinder + lid. Therefore, virtually no waste of filament and it work well for those of you with and without and AMS.

Let me know if you like it or have any other feedback.