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Found a flaw of my auger design, it is not capable or would be very difficult to lift the first layer of beans, above the perforated mask.
Without a minimal airflow able to make them levitate, those beans will stay on the mask forever, and char, or maybe even burn.
To fix this, the auger must be precise done, ending at the level of mask with a paddle /blade, acting as a spade that shave the beans on the mask.