This stand fits a Mac Mini M1 plus an external M.2 NVME enclosure pressed against the bottom of the Mac. The idea is for an aluminum drive enclosure to dissipate heat into the Mac Mini shell and take advantage of the active cooling.
The M.2 enclosure should be max ~11mm tall, ~43mm wide, and 116mm long. I sized it for this model: https://www.newegg.com/ssk-he-c325/p/0VN-0616-00005
Note that the photos are from version 1 - I tweaked the vents to print cleaner and made the fit a bit more snug in the uploaded model.
The author marked this model as their own original creation.