Hygrometer stand for 4L food storage containers repurposed as filament storage. I use the Skroam containers from Amazon, but other containers of similar size/shape should work.

The filament spool rests on the angled plane of the hygrometer stand, pushing it forward toward the face of the container and keeping it in place. Fits standard circular hygrometers with a decent amount of tolerance on the ring size. Ring depth is less than that of the hygrometer, making it easy to pop back out or open the battery compartment without removing it from the stand.

Prints in about an hour and does not require supports. Uses only 25g of PLA filament.