Print, put inside your SUNLU 1kg spool, fill with desicant. Ideal for AMS or other filament boxes to keep filament dry. Prints without support, I used 0.2mm layer height and PLA.

Holes are up to 1.5mm so use dessicant that is 2mm or bigger. I used 3mm silica gel balls but activated alumina would be even better

SOURCE: https://cad.onshape.com/documents/8d9a3effccf4e5027122b5ba/w/79cc809d1ad82c8844cb060b/e/196435472c073084e0d0b173?renderMode=0&uiState=64cbfad311884e21d66e9c11