Last time I made a R/C car out of a copter.

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Last time I made a R/C car out of a copter. But the gear set was from other toys. So I made my own gear set and printed it out with 3D printer. The noise is a problem now. Any thoughts on it?
http://www.thingiverse.com/thing:1398951

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http://www.gearsolutions.com/article/detail/5954/noise-reduction-in-plastic-gears

good info ^

Also note the profile comment they made. depending on how the gear profile was created it may not be a true or optimal tooth profile. I use Solidworks professionally and they have a tool box of parts that can be generated. they look nice and function all enough in the model but the gears are not a true involute profile. I ave not tried to print them yet but i suspect they may suffer the same problems.

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@Bryan_Barnes_BBmech7 Thanks Bryan. It really helps. Plastic gears could have such problems. I’m considering how to improve the design. Great info : )

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Helical gears reduse a lot of noise. On Rc helis they use them also a lot