Filament drybox from IKEA Samla 22l box, 8mm rods, and 608 bearings. Fits up to 5 rolls.

Does not need any fasteners, but a M3 screw from the bottom in each end makes it more stable and easier to adjust.

Part list:
 

• 2 single version
• 4 double version
• 2 rods of 8x300mm
• 20x 608 bearings. Any should do, so I bought the cheapest
• IKEA Samla 22l

Optional:

• Some kind of gasket for the lid
• Lid clips
• PC4 drybox feeder with PTFE coupler and PTFE tubes (use 2.5mm inner diameter)
• Hygrometer + some holder

Prints very quickly, no supports and little filament.