Hygrometer Filament Roll Holder

This part holds a hygrometer inside the hole of a filament spool so you can see the humidity level while the spool is in a filament dryer box.

Adjust the OpenSCAD file as needed to fit your spool(s).

Note that every roll of filament from every manufacturer may have a different spool hole diameter. In fact, even the same damn roll of filament may have different diameter holes on each side! Don't bother printing this for a snug fit, just  make it too small and add some tape either on the body of the print or on the lip to hold it to the spool. The spool is slowly spinning around so it's not like huge forces will send it flying out into space.

Read more about this project: https://rasterweb.net/raster/2022/09/18/hygrometer-filament-roll-holder/