Update: 4/5/18 Same big long bolt and nut but with a dull edge at the end. It now measures 142mm wide. Don't go by the pictures as they weren't updated. Go by the last 2 stl image files uploaded.
Update: 2/5/17 For those that like it big and long, there is a new "stl" file that should satisfy your needs. It measures 140mm instead of the original 100mm.
This is the big version of my other part: http://www.thingiverse.com/thing:2067525
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.
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 105mm opening and 102mm wide. I implemented those dimension to suite someone else's request. I have not printed this out myself. My pictures are of the smaller spool sprocket. (See picture of Step 5 for dimensions of this thing.)
There is a second bolt that will handle spools 140mm wide.
Print with supports but only on the plate or adjust your overhang angle to 50 degrees to avoid getting support material inside the body of the bolt.