Magnetic Spool Rewinder for Dryboxes (F360 Parametric)

I hate dealing with the last meter of filament sticking out of a drybox after I printed directly from the drybox. I used to push the filament back into the drybox, but it is not always a smooth operation.

Recently I discovered a magnetic solution from EC248 on thingiverse which I really liked (https://www.thingiverse.com/thing:7067196). Their solution is done in OpenSCAD, and since I wanted to be able to further modify it, I decided to implement a similar model in Fusion 360, as I am not friends with OpenSCAD yet. If you prefer OpenSCAD, you may use the model directly from EC248.

My model consists of 4 parts:

• Main tube

• Dessicant cap

• Internal knob (you need 2 pieces of the same size for each spool)

• External knob (you need just one)

Bill of Materials

• 6mm x 6mm magnets - 12 pieces for each drybox and another 12 pieces for one external knob

• 8x6mm magnets (8mm wide and 6mm tall) - 10 pieces for each drybox and another 10 pieces for one external knob

The model is parametric, so you may adjust dimensions to fit your specific drybox / magnets used, etc.:

• magnetHeight (default 6.1mm) - value includes tolerance to fit the magnet in

• magnetWidth (default 6.1mm) - value includes tolerance to fit the magnet in

• magnetCount (default 12 pieces) - keep it an even number, and when installing the magnets, alternate their orientation

• mainPlateWidth (default 70mm)

• tubeLength (default 75.5mm) - length of the threaded tube

• plateHeightBelowMagnets (default 0.4mm)

• tubeCapDepth (default 12mm)

• spoolInternalDiameter (default 55mm) - specifies size of the internal knob to best fit your spools. I am using 50mm for Prusament and 55mm for Polymaker spools. Both are included as STLs.

To modify the parameter values, open attached f3d file in Fusion360 and go to „Modify“ -> „Change Parameters“. Attached STL files use the default values listed above.

I use magnets 6mm x 6mm which are sufficiently strong to move the spool. I would not use smaller magnets though.

Overall length of the tube that goes inside the drybox is calculated as tubeLength + magnetHeight + plateHeightBelowMagnets (= 82mm in my case) = adjust the values so that this will fit into your drybox. 

Fusion 360 F3D file is included so you may futher modify the model to fit your needs.

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UPDATE 23.10.2026

So apparently if you are using card board spools, and the spool is full, then 6x6mm magnets are sometimes not strong enough to overcome the friction. So I bought various larger magnets and started testing. I tried 8, 10 and 12mm magnets. Since bigger magnets are more expensive, it is more economical to use smaller ones even though you need more of them.

My recommendation is to go with 10 pieces of 8x6mm magnets (8mm wide and 6mm tall).

I attached new STLs with this magnet configuration. 

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UPDATE 30.10.2026

Updated F3D file (v2) which now includes the funnel and the internal knob for the OpenPrintTag (see remixes).