Parametric Slim Herringbone Gear Set With Embedded Setscrew And Helix Angle

This is modified version of the ScribbleJ's parametric herringbone gears, my first openscad design. Intended for a reduction gear box.

Additions:
-Fixed captive nut position for rack gear
-Helix angle modifier parameter added(you should keep helix angle under 45 degrees unless you know what youre doing)

Missing:
-Rack gear hex nut sink removed because the bigger gear is also going to be used on a 5mm shaft on my project. You can revert it back to on by modifying parameters though.

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