Disclaimer : not my design.
I found this, this morning - and I know without a doubt it will be a warmly recieved here with many of you already dabbling in their own home made seed cleaners.
Well I’ve never gotten into 3d printing myself, but I might have to find someone who can help me get my feet wet for the sole purpose of making this:
I found it posted by a Reddit user jjthegreatest and he goes on to say.
What is this thing?
I call it an “air column seed classifier”, the goal is to separate seeds (basil, in my case) from chaff and then classify those seeds based on quality. It’s not a new idea/concept, but the only examples I have been able to find online are large and cost thousands.
Does it work?
Honestly, yes it works pretty well. While it can’t clean and sort everything perfectly in a single pass (that’s my ultimate goal), it can do it in about three passes. I can take a cup of mixed seed and chaff, and in a few minutes, be left with high-quality seeds, perfectly separated.
While I designed this with basil seeds in mind, it should work just as effectively with most small seeds.
How does it work?
The idea behind this device is simple: high-quality, viable seeds tend to be denser than lightweight duds and chaff.
Using a controlled column of air flowing upward through the device, the seeds and chaff naturally stratify based on their density and aerodynamics:
• Light chaff gets blown out the top or captured in the upper sections of the chimney.
Seeds settle into layers, with the densest, highest-quality seeds staying near the bottom, while lighter, less viable seeds collect at higher levels.
The chimney walls have rings of angled holes spaced at vertical intervals. These capture material at different levels, while collection bins clamped around the outside of the chimney hold the separated seeds.
The entire 3d instructions are posted free Air Column Seed Classifier by Overton_Prints - Thingiverse
I don’t think I have made enough for a contraption. I’ll stick with the old school ways as my fire fathers did 
