daniella, I don’t beleive that dust is and issue here. I have not sifted (npi) through all the sources on kitniyos, but I have seen many and cross contamination with dust does not come up. It is noted in halochos of the flour grinding, and matzo baking. From what i have seen with my own inquisitive eyes, there is more chometz in the matzo than in the kitniyos. Some cases: In a major Brooklyn bakery, I saw florescent bulbs in the stair wells and the work areas coated with white grunge. In a very famous family operation, they used a professional dough docker (rheddler) to perforate the matzo. They cleaned it by running it over a motorized wire brush wheel, spraying whatever may have been on the rheddler into the work room. In Jerusalem, I saw a major matzo op, using alternate tables and multiple doughs to minimize labor down time. Between tables, the crew wiped down their stainless rolling pins, but did not wash their hands. And there are the famous stories of the Bais Halevi and his matzo baking precautions. So enjoy your machine maztos, just watch out for the fingertip, hands, arms, bone fragments or other unintentional inclusions of human body parts.
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