This is PETG, one was left out in about 40% humidity the other was dried to about 20%
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Mine is just Polydryer. Keep the box low humidity keep the filament low humidity.
Need more testing to see how well this works though since swapping filament in these boxes is inefficient and the beads quickly get used before you need to reset them.
Only do this if you have money to burn, or you are doing 3d printing as a business and at scale