I made a version 2 of this thing for spools that may need a little more width. Here's the page for USRv2:

https://www.thingiverse.com/thing:3341611

Note if your spools fit, the tapered rollers on the original version can deliver lower friction.

Tired of adjusting your roller to fit different spool widths? Tired of spools jumping off your roller in the middle of a print? Is your current roller too big to fit in your dry box?

Solve these problems and more, with the one size fits all derail proof...

Ultimate Spool Roller!

• No need for adjustments
• Works with a wide variety of spool sizes (~165-215mm dia. X 0-69mm wide)
• Spools will not jump off the rollers while printing
• Tapered rollers eliminate side friction
• Fits inside Rubbermaid 21 cup dry box containers
• Can be used as a standalone roller
• Easy to print (<=45degree overhangs & minimum bridging)

To complete it, you will need:

• 2@ printed rollers (spoolRollerRoller.stl)
• 2@ printed side frames (spoolRollerFrame.stl)
• 1@ printed desiccant riser (spoolRollerDesiccantRiser.stl), or printed plate (spoolRollerPlate.stl)
• 4@ 608 size ball bearings
• 4@ M3x6 bolts

The desiccant riser is convenient if you are using Rubbermaid 21 cup dry boxes. If you don't want the riser, use the standard plate for a base, or optionally bolt it to the top of your enclosure if that's how you roll... no pun intended (70x70mm bolt pattern). Here is a link to the PTFE bulkhead I am using on my drybox cartridges (shown in the photos):

https://www.thingiverse.com/thing:3223256

It works perfectly for my printer, which has a PTFE filament guide coming out of the heated enclosure. When I swap filaments, I plug the bulkhead with a scrap piece of PTFE, folded over with a zip-tie for easy handling, and sealed on the end with hotglue.

Enjoy, and Happy Printing!
Kevin

[Update: I modified my flat plate design to use as a desiccant riser. This will save a bunch of filament versus the originally linked desiccant riser thing shown in the photo (8.6m vs 15.6m of filament), and it's a more elegant design (IMHO). I also increased the axle radius, since I felt the fit was a bit loose with normal (non-printed) bearings.

Update2: I am almost done testing a version 2 of my roller. It will use even less filament and increase spool width capacity from 69mm to 79mm. The new design uses a slightly wider base since there was 2mm of width left to spare in the 21cup dry boxes. As such, all of the parts have changed slightly.]