Helical Gear tutorial?

I need to create some very small helical gears., probably a mod 3 or 3.5. However no small cutters or hobs are available ‘off the shelf.’ I was wondering if anyone has created a 3D printed gear that works? I would use the printed gears as masters and cast copies in either epoxy, urethane, or brass. I experimented with Rhino Gears back when I was running v5, but never made a physical gear. I may have to load v5 back up if it doesn’t work in v7.