This one has been around for more than a decade and seems to work well in many videos compared to other do it yourself designs. Open Source free to use and share.
Original video:
Another user:
Free Plans Here:
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I would just add that I have created this from the plans and they worked really good and the machine is super helpful and good for a home scale winnowing machine.
This one I have seen in Antibes, France also and those using it said to it worked well and was quite widespread