Filament Dry Box Insert

Wet filament is behind more failed prints than any other single cause — stringing, popping, weak layers. A sealed box with desiccant fixes it, and the printed part is the roller assembly that lets the spool turn while the lid stays shut.

Fits: Standard storage boxes, 1 kg spools

Make this one yours. Cadio generates it to your measurements — change the size, slot count, or angle by describing what you need.

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Key dimensions

Roller spacing	Sized so the spool cannot jump out
Bearings	608, press fit
PTFE port	4 mm bulkhead fitting
Desiccant tray	Separate, under the spool
Spool width	Up to 70 mm

Print settings

Material	PETG
Layer height	0.2 mm
Walls	3 perimeters
Infill	25%
Supports	None
Orientation	Base down, bearing seats up

What actually matters

The seal matters more than the rollers. A perfect roller assembly in a box that does not close tightly still lets filament absorb moisture.
Use colour-indicating silica gel so you can see when it needs regenerating rather than guessing.
Set the roller spacing so the spool cannot climb out when the filament pulls — too far apart and it jumps the rollers.

Questions

Does this really improve prints?

For PETG, nylon and TPU, dramatically. PLA is less sensitive but still benefits after a few humid months.

Which box should I use?

Any airtight box tall enough for a spool. Generate the insert to your box's internal dimensions.

Need it in a different size, or with more slots?

Generate your version →