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Polydryer Humidity: October
Another month of data from all those Polydryer boxes:
7 Oct 2025 8 Oct Filament %RH Weight – g Wt gain – g %RH PETG White 28 26.6 1.6 19 PETG Black 25 26.6 1.6 20 PETG Orange 29 26.6 1.6 21 PETG Blue 23 26.7 1.7 15 PETG-CF Blue 26 26.6 1.6 23 PETG-CF Black 23 26.4 1.4 20 PETG-CF Gray 30 26.5 1.5 26 TPU 28 26.3 1.3 27 Empty 1 → White 35 26.7 1.7 37 Empty 2 36 27.1 2.1 24 The “PETG White” spool in the top line is nearly empty, so I loaded a new spool into the “Empty 1” box.
The “Empty 1” 35% value on 7 Oct matches the other empty box, the desiccant having pulled the humidity down from the 51% basement level. The weight of the water pulled out seems low compared to “Empty 2”, as they both started with a fresh batch of basement air while changing the desiccant in September.
They’re again filled with 25 g of alumina beads, although I’m beginning to think silica gel does a better job.
A picture of the boxes, thus avoiding WordPress reminding me pictures improve SEO:

PolyDryer PC4 Fitting – Prusa MMU3 setup