Horizontal Filament Spinner for Dehydrator

UPDATE 20190706: got rid of the unneeded lip and generated an STL for 90mm to fit on the shelf for storage. Discovered the outer shell isn't necessary so added that to the to-do list.

This is a remix of my horizontal spool holder/spinner (https://www.thingiverse.com/thing:3128111), but customized to fit inside a common food dehydrator, for a DIY PrintDry clone. I basically sized everything properly, and added a hole down the center for the air column.

The idea is that you can print from a roll of filament while it's drying in the dehydrator (filament dryer). This model allows the spool to spin freely as filament unwinds.

The dehydrator I use is the very popular Commercial Chef CCD100W6 (https://www.amazon.com/dp/B075ZB3V9S/ref=cm_sw_su_dp) which apparently is the successor to the Westinghouse WFD100W.

You will also need to print one or more Dehydrator Tray Extensions so the shelf is tall enough for a spool. davidhbrown's multipart model is https://www.thingiverse.com/thing:2795773 and andreq's one-piece remix is https://www.thingiverse.com/thing:2814779. You'll need to either add a filament exit hole into the model, or drill one after printing.

As with the original spinner, you'll need some 4.5mm BBs to serve as ball bearings. I'm having success with Daisy zinc-plated steel (https://www.amazon.com/dp/B075ZB3V9S/ref=cm_sw_su_dp) but I'm sure anything is fine as long as it's 4.5mm for the STLs. If you have a different size, you can set that in the SCAD file.

The minimum spool hole diameter for the STL versions is around 49mm, so not all spools will work. I tested a Hatchbox spool and it fits great, as long as the shelf extension is in the up position on the tabs, because the Hatchbox spool is pretty wide (tall when on its side). You'll want to have at least one shelf on top, not the lid, because that lid has downward indentations that can touch the spool.

There are 2 STL files: the 67.6 version which is the absolute minimum size using 4.5mm BBs, and the 100, which is designed to place the bearings underneath the average center of gravity of the filament (just guessing). The larger one with more bearings in a larger ring spins significantly more smoothly but the smaller one spins fine.

There is also an OpenSCAD file so you can customize it if you like, either in Thingiverse Customizer (though I haven't tested) or on your own computer.

My printer isn't totally dialed in so there's reasonable slop between pieces. You can tighten up the tolerances if your printer is dialed in and you like that sort of thing.

There's no reason you can’t print multiple of this and the shelf extensions and have multiple spools in the same dehydrator. I plan to try this for my Mosaic Palette 2 Pro, which takes 4 inputs.

Bugs/To Do:
* I totally hacked in the differences from the original, so some code cleanup is warranted
* DONE (made a 90 to be safe) -- I found that the 100 is just a bit too large to be stored in a dehydrator tray but off-center -- i.e. between the outer wall and the inner wall -- so I need to generate a slightly smaller one instead (around 94 I believe)
* DONE (on the 90) -- There is a vestigial lip on the outer edge of the spinner top that doesn't need to be there
* outer shell of spinner (and outer edge of base) isn't necessary so can be removed to maximize the size of the bearing ring for a certain overall diameter

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