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Thank you so much for getting back to me and providing that information. So, I input updated bed information. I just had to guess because I don't actually have any parts yet and sourcing a 400x400 aluminum heat bed is proving a little difficult. I can find plenty of 400x400 heaters but not the built plates they are intended to heat. :P As for the spreadsheet, I included a picture of the updated information and it appears to be OK. One thing I noticed is, with the previous, smaller build plate information and with the updated information, it doesn't matter what bed bracket i choose, it always says "OK". So I can use any bracket, regardless of build plate volume? That doesn't seem right. Or, maybe I just guessed really well and the proportions are the same. :)