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Over the weekend I made my first model in . The design is of a contra-rotating gearbox, based off this video youtube.com/watch?v=xda1WgL9fd

It allows two propellers to rotate in opposite directions with one motor. This reduces the torqueing that occurs with just one.

I'm going to be using it for my to keep it small.

Here's the 3d printed result. It doesn't turn as well as I would have liked. I think it's mostly down to an issue with the print but there are a couple tweaks I could do to make that less likely

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