Decided to test this library by making some gears for no particular purpose - used 0.1 mm layers with a 0.2 mm nozzle in PLA. GCode generated with Skienforge, infill 30%. Bed at 50 degrees, nozzle at 230.
I actually cancelled the build of the smaller gears (circular pitch of 100) because they looked suspiciously like they might not come out right and started instead printing the larger ones with a pitch of 140. As it turns out though, the smaller gears work a treat too! That's 40 reliable teeth on a 23 mm diameter disk!
Next I think I'll try and work out a nice plugin for Moray (an old modelling package for POVRay) which can utilise this excellent gear generating library :D