Stackable Ikea Samla Drybox and Spoolholder.

You have an option of printing either just drybox for 2 spools, or spoolholder for three spools, or both. Dybox was able to maintain 16%-18% humidity in environment with in between 45% to 92% humidity for a month.

Print Slider_2x and PVA_table for Drybox, Slider_3x, thirdspoolholder-table and thirdspoolholder for the Spoolholder.
You will also need Ikea Samla box(es), some M3x12 screws and nuts, also 4x 608 bearings, which you can repurpose from you MMU2S upgrade, if you have one.

Assemble the sliders according to the images. Note that in the case of spoolholder for 3 spools, there are different sets of sliders for sides of the box and for the middle.

Drybox and spoolholder tables should be assembled with the rivets, with flat part facing up.

Regarding the drybox, you should fill the Table with desiccant, such as Silica gel with indication. I am using Orange to White, which can be dried in kitchen oven.

Print instructions

All .STLs are in the .3MF prepared as plates (just shift+drag for selection).