Re-work on retainer assembly to allow for more margin for error/less precise printing
Bolt increased to M8
Fattened out retainer clips
Extended Key Post (probably can get away with not reprinting this)
Will work on rotating parts to be print ready in next update
This is a long standing project of mine. The goal was to design a fully adjustable 3d printed spool/reel holder that can free-wheel. The result of my efforts is this.
The spool holder supports hole diameters between 51mm and 88mm.
The only additional hardware required is 8 small screws to mount the rail guides to the uprights. In future revisions I plan on reworking the adjustment system (think document feeder paper adjustment). For now, it is functional and rigid, but a little janky to adjust at the moment.
At the core of the project is emmett's Gear Bearings https://www.thingiverse.com/thing:53451 (give him some love). These make it possible for the spool to spin smoothly without needing to source bearings in small batches or any of that nonsense (no ebay).
With the exception of the adjustable spool screw, everything can be printed without supports as long as you orient it correctly on the build plate. For the large spool screw, use supports for the lower bearing recess.
Tolerances - The tolerances are tight in the design, expect to do a little sanding (not much) on the parts that interact.
I included STL files for gear bearing with fairly forgiving tolerances. If you have trouble with bound gear bearings, you may need to roll your own. The important dimensions for them are:
Outer Diameter: 39mm
Keyway Width: 6.5mm
Included is the CAD file for anyone who wants to hack away.