I am very new to this (1 month since I got a 3D printer, and very first thing shared with others!) so don't hesitate to tell me if I need to clarify or change anything to my post.

This is a remix of the FAST Print In-Spool Desiccant (Silica Gel) Container with Hygrometer by PsychProd, and adaptation from its remix to make the body stronger (Stonger body by Woodwaker). Both models were fantastic, but I just had 2 concerns after printing:

• The diameter of the container was too small for many spools and would not stay in place in the center hole.
• Those round hygrometers have the air inlet on the bottom surface, which was encased in the original design, directly facing the silica inside the container, leading to falsely low humidity measures (10+% lower than the actual spool container air).

So I inserted vents in the bottle cap and added a vented surface between the thread for the bottle and the portion that holds the hygrometer, leading to a more representative air read by the hygrometer.

I also added a screw/ring with wings at the bottom and wings on the cap, so that it can hold in place inside the spool hole.

I also felt the original version's body was a little weak, so I liked Woodwaker's remix, but I added fewer columns in the bottle wall, and preserved the vented bottom for the original bottle (as this remix had a solid bottom) to improve air contact/flow.

Oh and bonus (totally unplanned but a nice coincidence), with the vents in the cap, you can access the battery flap to change the battery without having to pop out the hygrometer from the cap.