I am one of those that makes the real thing TM, at those sizes I dont
expect quality from cheap 3d printing.
when I get the 5 axis powered up I could generate one if someone gives
me the dimensions.
or possibly an excuse to get the hobbing machine working.
Another job on the list is to add spindle feedback to the 5 axis mill
then it too can hob gears.
For some one offs I just dremel up a flycutter and hack some standard gcode
then let the 5 axis handle it as :-
http://www.youtube.com/watch?v=HAtziCsUj5Q
At these sizes and duty cycle one can get away with a few inaccuracies
http://gears.archivist.info/gears/index.html
Dave Caroline