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For installation on 30mm diameter hole on stock printer brackets (sheet metal). Sheet metal thickness 1mm.

I have been using 4 bearing spool holders for a while but the spool fell over 2 times so far during long prints and ruined everything so this will be a better solution.

Other parts necessary for this build are:

• 1x M5x80 hex nut and bolt that connects all the parts together
• cheap 608 sk8 bearing
• superglue or composite glue for the lock ring and hub adapter and maybe the bearing

Some printers may have issues with easy unwinding due to vibrations and low friction of this design, this may be easily countered with a simple addition of a tape or zip tie on crucial places to add some friction, be sure not to overdo it as it may result in extruder skipping.
It needs to be dialed in on any bearing spool holders but some filaments benefit from less friction, see what best suits your print setup

UPDATES:

• version 2, speed holes on cones, improved fitment tolerances on other parts, mind the layer height on the threaded parts, print the nut with 1% scale up (within slicer) for easier fitment (if necessary on lower quality prints)! Scaling more than that will probably offset the thread pitch. Thread printing can be a problem due to thin outward overhang which results in internal stress while cooling and maybe cracks/dimensional inaccuracy

• version 3 - LARGER CONES, increased angle, increased tolerances on the thread, larger spool adapter (if needed on larger spools)

SPOOL COVERS:

I have cobbled up some removable spool covers mesh racing wheel, roulette... but you can create your own covers that spin on the timelapse videos.
The mounting hole diameter is 22mm.
I have few other ideas that will be added when I catch some time.

• Racing mesh wheel
  https://www.thingiverse.com/thing:4847039

• Roulette
  https://www.thingiverse.com/thing:4853008

• Kinetic wave spinner (new)
  https://www.thingiverse.com/thing:5634171

REMIXES:

kpishere - https://www.thingiverse.com/thing:4842674 - prusa addon

Take a look at my other designs:

https://www.thingiverse.com/thesloppyapprentice/designs

Take a look at my youtube channel:

https://www.youtube.com/channel/UCqKU0euRjGItYjY0grGPFjw

I bet you find this design somewhat helpful, saved you some bucks on less bearings so feel free to leave a tip, I accept cryptocurrency also although it is harder to buy a hot beverage with it. thanks