608 Bearing Roller Hub for Polymaker PolyDryer XL for non-NFC prusament 2kg spools
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This hub should work for other spools as well, but I developed it because printedsolid had a sale on 2kg prusament.
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You need 2 m3x20 or m3x15 screws. I suggest using 2 nuts on the ends of the screws to secure them.
The main section "hub" has raised rims that the prusament spool rides on. Use fuzzy skin on the inner surface of the hub end to secure the 608 bearings.
The fuzzy skin goes on the top and the bottom of the hub where it shows blue in the picture below.
If it rolls too freely compress the ends in so that there is some friction with the hub.
Thanks to @KenNiemi_3979851 for the design of the nut and initial implementation of the bearing assembly. He uses scad and I think that's insane. I translated his design into tinkercad. The obj file for the hub has 'parts' and you can separate the model into these parts to make minor changes (for example changing the diameter of the hub rod or its length) directly in prusaslicer.
I will include the mk3 file so you can see how I did supports and where to place the fuzzy skin. I used full contact support printing the model in pet and the supports in pla.