Hey guys. A while ago I made a thread about my gear slipping off the extruder motor and a someone helped me solve the problem but it happened twice after that. I was wondering if theres a different, more reliable extruder I can use that uses printed parts? I wanted to use this http://www.thingiverse.com/thing:456025/ but I seriously can't find any local shop or even an online store that sells the 65t pulley and the looped belt that's 196mm in length.

Thanks for any suggestions. Cheers.