Really interesting, I'm planning to built one too.
My idea was to have a long plan surface to smoothen the edges and a large diameter contact wheel to clean the surfaces.
I found 2500-2000mmx50mm belts that would be good to create that long surface. Plus that widht is what most wheels are.
I made a lot of internet researches about the argument, but the more I look and the more it gets confusing.
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