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Cereal Container Filament Drybox – Ø20mm Axle – Adjustable Height – PTFE Feed Port

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Model information

Source: Printables
Category: Accessories
License: Creative Commons — Attribution — Noncommercial — Share Alike

Details Makes & comments Remixes Collections

This project allows you to convert standard cereal storage containers into practical filament dryboxes.

The printed side mounts are screwed togheter through the container wall and support a Ø20 mm axle, allowing the filament spool to rotate smoothly while printing directly from inside the container.

The design includes eccentric spacers that allow fine adjustment of the spool height to ensure compatibility with different spool designs.

A drilling jig is included to guarantee precise hole placement and simplify installation.

The project also includes a sealing plug for the original container top opening, allowing installation of a PTFE tube feed-through so filament can be printed while the lid remains fully closed, helping preserve dry storage conditions.

The system is also compatible with the spool support tube included with the Polymaker PolyDryer, allowing users to reuse existing hardware.

Designed to turn common storage containers into functional filament dryboxes using simple printed parts and easily available hardware.

FEATURES
• Supports standard 1 kg filament spools
• Adjustable spool height
– No spacer: 0 mm
– Spacer position A: +2 mm
– Spacer position B: +5 mm
• Uses Ø20 mm axle system
• Compatible with PolyDryer spool support tube
• Includes drilling template
• Includes sealed PTFE filament feed port
• Allows printing with lid closed
• Smooth spool rotation

REQUIRED HARDWARE (BOM)
• 6x M3x8 screws
• 6x M3 threaded inserts
(The holes are 4mm, if you don't want to use the threaded inserts, use M4 screws instead of M3, and screw them directly into the plastic)
• Ø20 mm PVC pipe OR PolyDryer spool tube
• PTFE tube (standard 1.75 mm filament PTFE)
• Cereal storage container
• Optional desiccant / silica gel

ASSEMBLY INSTRUCTIONS

Step 1 – Mark drilling position

Use the included drilling jig.
Tape the container wall and drill the mounting holes.

Step 2 – Install threaded inserts (optional)

Install inserts into the printed supports if used.

Step 3 – Mount supports

Attach supports to both container sides using M3x8 screws.

Step 4 – Install axle

Cut the Ø20 mm PVC pipe to container internal width and place between supports.
Alternatively, use the PolyDryer spool support tube, or print the included axle

Step 5 – Adjust spool height

Select spacer configuration depending on spool type.

• No spacer → lowest position
• Spacer side A → +2 mm
• Spacer side B → +5 mm

If you build this project, please share your make. I would love to see your setups and improvements.