Dry Box Spool Holder - Bearingless Remix
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Slight remix of @bradm10000's excellent "Dry Box Spool Holder" (for Rubbermaid 21 Cup dry boxes).
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- Creative Commons — Attribution
Kudos to @bradm10000, this is a great filament spindle design. It easily secures any spool I've tried without adapters or modification.
I've adjusted it for my particular way of using Rubbermaid 21 Cup containers as filament dry boxes, as well as using it as the basis for a custom spool holder for @FrybyAdditive's V-Spooler (I'll post a separate remix).
See my BarrittWorks video “No More Wet Filament!” about my dry filament system for an overview of the assembly process for these dry boxes (at 5:55).
Differences from the original:
I've switched from using 608 bearings in the original to using plastic "nubs" that rest in the mounts, giving the spools a bit more controlled friction as they turn (to avoid periodic spool runaway and to simplify the spindles). I've included files for the numbs in 4 lengths (I am currently using the 11mm versions almost exclusively, I switch to one of the others--12mm, 13mm, or 14mm--if a Rubbermaid box is particularly bowed).
The "screw" part has been shortened by 2 mm to 83.5mm to allow more tolerance for variations in the contour of the Rubbermaid 21 Cup containers (not the most precise parts) and for glue thickness variations under the mounts, all to avoid some containers binding the screw/spindle between the mounts.
I've resized the screw holes at each end of the screw/spindle part to 4mm dia. to accept M3 heat inserts and I use M3 x 10mm button head screws to attach the bearing "nubs."
I've created a jig to position the mounts during glueing so that there is no need to measure and mark their positions before glueing (hot glue in my case, works great).
About the mount glueing jig: I created it years ago and apparently I've done a poor job keeping records, I no longer know where it originated. I worked with a mesh from someone else and did some subtractions and cutting to get what I wanted (lowered it by 30mm, and created the contours that allow the Mount pieces to register in place during glueing). Sorry I cannot properly attribute the origins of this model.