Simple Filament Dryer (Filament Box + Holder)

Description

This project turns the original 1 kg filament cardboard box into a simple drying chamber and uses a 3D printed holder to keep everything stable on the printer bed and to mount a round hygrometer at the front. The holder also ensures the cardboard box does not sit directly on the build plate, creating a small gap and helping to reduce direct contact/heat exposure.

You modify the box (cut the bottom, cut a hygrometer hole, add ventilation holes), slide the spool in, close the lid, then place the whole unit on your 3D printer’s heated bed. In general 60–70 °C works as a practical target depending on the filament.

Print Material: I printed the holder in PETG, because it handles higher temperatures better than PLA.

No Supports needed

Parts Needed 

1× 1 kg filament cardboard box (the one the spool came in)

1× 3D printed holder (this model)

1× round digital hygrometer ( Linked Bambu or this one https://amzn.to/4jrOs6b )

Instructions

1) How to Prepare the Box

2) Assembly

3) Usage (Drying)

Important

Do not leave the box unattended. Especially during the first runs, check the cardboard regularly (softening, warping, discoloration, smell). If anything looks off, stop immediately and lower the bed temperature.