First off -- this is sweet and you should be proud.
Without data, I'm skeptical of the claim
> that gravity does most of the work to reduce retention
Naively, I'd guess that the increased surface area from the cylindrical burr increases the retention rate since it's mostly caused by static cling. There's mention of a built-in knocker, but even with the dissected machine photos, I can't tell where that knocker is housed or how it would function.
Without data, I'm skeptical of the claim > that gravity does most of the work to reduce retention
Naively, I'd guess that the increased surface area from the cylindrical burr increases the retention rate since it's mostly caused by static cling. There's mention of a built-in knocker, but even with the dissected machine photos, I can't tell where that knocker is housed or how it would function.