Filament Spool Roller with Hygrometer & Desiccant Holder (for 4L Storage Boxes)

Keep your filament dry, visible, and ready to print — all in one compact system!
This custom-designed spool roller with integrated hygrometer and desiccant holder is built specifically for the popular 4L airtight food storage containers, making filament storage easy, efficient, and clean.

Features

• Spool Roller System: Provides smooth filament unrolling using standard 608 2RS bearings, ensuring frictionless feeding.
• Integrated Hygrometer Mount: Includes two versions with 60° and 75° viewing angles to suit your preferred box placement and viewing position.
• Precision-Fit Base: Bottom profile and cutouts are shaped to lay flat and flush against the container’s floor for maximum stability.
• Improved Desiccant Tray: Features multi-rib design for better air circulation and enhanced moisture absorption. Sized to fit under standard 1kg spools without interference.
• Tailored for 4L Containers, fully enclosed with the lid on. Compatible with:
  • Amazon PL
  • Amazon DE
  • Amazon IT
  • Amazon ES
  • Amazon FR

Hygrometer Compatibility

Designed for a press-fit rectangular hygrometer such as:

• Bambu Lab Rectangular Hygrometer
• AliExpress Hygrometer (same size)

Printing Recommendations

• Material: PLA work fine, use PETG or ASA for best strength and humidity resistance
• Layer Height: 0.2 mm
• Supports: Minimal (only for specific parts if needed)

Assembly

• 4x 608 2RS bearings
• Rectangular hygrometer (press-fit)
• Desiccant (e.g. silica gel in a small mesh or open container)

Notes

• Designed to be fully enclosed within the box with the lid on — ideal for passive dry box setups.
• Can be used for all standard 1kg filament spools.
• PTFE tube passthrough version will be added in a future update for those printing directly from the box.

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If you have any feedback or improvement suggestions, feel free to leave a comment.