UPDATE Nov 5, 2023: I updated this to be a two part design that snaps together (no fasteners). This prevents the need for any support material and clean out prior to use. The stand itself is one piece and now the shelf/pockets are a separate piece with 2 snaps on each side. Print them both, then align the snap hooks (which protrude a little bit from the rest), making sure the shelf/pockets are facing up (see images), and press to snap into place. These were a nice, tight and confident fit when I assembled it.

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This is a simple stand designed to help my sons keep their Invisaligners organized from week to week after they ended up making a major mess and were off schedule with their retainers. This stand has a slot for the current week's aligners, a slot for last week's aligners (just in case) and the stand has a base made to fit the box they come in. Images show a name at the top… I've included the STL file so you could make that addition if you want.

HIGHLY RECOMMEND using Normal Supports to make removal easier. I printed the second one of my own with Tree (Auto) supports and it was a major headache to remove, whereas the Normal (Auto) supports only took a bit of work. These were same-material supports, not the special support material you can get.