Timer pulley

I designed this a couple of weeks ago. The pulleys look good when printed, but at least when using a standard .5mm nozzle, the teeth are not "sharp" enough and the timer belt slips too easy.

When MakerGear published their z pulleys ( http://www.thingiverse.com/thing:1081 ) I asked how they managed to avoid the slipping. Well, they use a .4mm nozzle...

Since MakerGear asked for my design: Here it is.

Again: These pulleys print nicely and also kind of work. The only thing is, that the tim