Pulley Teeth Defination Poor (no replies)

I just build my Reprap Huxley and from the start it prints great. But when i tried to print pulleys (GT2), there is barely any teeth definition, it just prints a wavy cylinder. Upon closer inspection i saw that the spacing between the teeth is correct but they are just not deep enough.

Im using a 0.5mm nozzle.

Any ideas on how to improve this?