To avoid using hydrometer (and batteries) I remixed the Filament Bunker V3 from MarsGizmo. Here is my video about it:
or Dry Box IKEA 2 spools: https://youtu.be/KPjKM7GRW38
👉 Dry Box: https://amzn.to/3pcEmeO
👉 Ball bearings
👉 Silica gel balls (silica gel) with indicator: https://amzn.to/3cUaihB
👉 Colorless silica gel beads: https://amzn.to/2Sbx4ds
👉 4mm/3mm PTFE tube
👉 Black PC4-M6 through-hole pneumatic fittings
Original model : https://thangs.com/marsgizmo/marsgizmo-Filament-Bunker-V3-12690
Thanks to MarsGizmo for these 👍
The author remixed this model.