*Note: Apologies to anyone who downloaded right away, it seems some of the STLs got messed up when I uploaded them all together. The broken ones have been
...Show more re-uploaded individually, and they appear to be ok now.
After 12 years of searching, and several unsuccessful attempts to buy some of these directly from K'nex, I stumbled upon one on eBay. I wanted more, so I turned to my printer.
Unfortunately it's too big for my printer (~129mm in diameter, my print area is 120 x 120 x 120), so I also drew it up as just the inner hub, which is all I needed anyway.
It fits a little bit tighter than the original, which has quite a bit of play, so it works well. I had to hone the holes out just a bit with a drill bit. My print was also a bit wavy, so I'm sure that's part of the tight fit as well. I also recommend flipping the STLs over so the surface on the inner ring gear isn't above supports, since gears will need to run against it.
Right now I've got:
Full gear with 90 deg bumps (Original)
Full gear without bumps
Full gear with 90 deg bumps reinforced
Full gear without bumps reinforced
Hub gear with 90 deg bumps
Hub gear without bumps
Hub gear with 90 deg bumps reinforced
Hub gear without bumps reinforced
Reinforced ones have a solid mid plate and bigger ribbing.
I'm working on a buildable version so smaller printers can make the full gear.
