Update: 2/13/2017 - A fully threaded nut has been added based on a couple of requests.
Update 4/14/2017 - A revised version of this was created to ensure the bearings don't stick. It can be found here: http://www.thingiverse.com/thing:2248245 (by xjedix)
This spool sprocket is intended to make removing a spool of filament super easy, as easy as changing tires in NASCAR competitions, (I wish). No really, it makes removing nuts a thing of the past. It works with standard 608ZZ bearings or without, your choice. See my spool holder as this is a perfect complement to that holder but it works just as well with most other standard spool holders. (My bearings were a nice tight fit. Use the power of muscle persuasion or maybe a shop vice in a worst case scenario.)
Visit http://www.thingiverse.com/thing:2009565 for my top mounted spool holder.
For a bigger/longer version of this thing visit: http://www.thingiverse.com/thing:2075777
Changing the filament is five EASY Steps:
- Remove nut(s) from one side of the spool threaded rod and insert the "Spooler Bolt." Fasten the nut(s) back on. You will never need to remove nuts again! I use 2 nuts on each side to lock them into place.
- Place your desired spool of filament, (with filament unlike mine) in place. The rod and spool can both lay on their side.
- Drop the "Spooler Nut" into place.
- Spin tighten the "Spooler Nut" onto the "Spooler Bolt." Because I used a minimal number of threads on the nut, it spins as easy as a butterfly nut. This makes tightening the nut, a real cinch. Hand tighten the nut and bolt to finish clamping the spool into place.
- Mount your "Spool Sprocket" on your printer's spool holder and center it.
To remove a spool reverse the steps above but skip step one. You're now qualified as a NASCAR technician. Now go change some tires!... I mean spools!
This spool sprocket should work for many types of filament spools. If it doesn't work for you, let me know in the comments and I'll see if I can accommodate your needs.
NOTE: This spool sprocket can handle a spool with a 30-65mm opening and 102mm wide. I implemented those dimension to suit my own needs. Feel free to use your slicer to adjust those dimensions to meet your own specific needs.
.1 Layer height .3 nozzle
I used supports only for the bearing. I designed the part to only require support inside the slot used for the 608 bearing which is easy enough to remove.