I found a lot of interesting information about 3D printers. One link is about parametric CAD model of pulleys.
All links are collected here, this link is the second last:
http://www.astrofriend.eu/links/link...-printing.html
If I can 3D print pulleys with enough accuracy it's fantastic. I can then print odd dimension and teeth numbers. If it not possiblie today it will be soon.
Next time I need a gearbox or timing belt drive I will give it a try.
/Lars