Flow of flutterative particles is dually beckoned from [relative under] and passively sorted via a filtering mesh. Particles smaller-than-size (defined by filtering mesh) are allowed to escape into the unaccount.
If you’re interested in seeing process docs, here’s a few posts you might like to check out, A Dime Buck Grand also has links to more general articles about embroidery animation:
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HUW MESSIE 