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  1. That depends how wide you build enclosure and how much rolls you have in width. I have 112-115mm (anything in that region will fit nicely), but as I said, it depends on enclosure width and filament count. If you have more narrower rolls, you can have shorter tubes.
  2. No, they are exactly correct for 12mm tubes. Do you maybe have 1/2" tubes (12.7mm)? as that may be a bit bigger. You can increase file tube holders a bit to accomodate larger tubes or print with 5-6% larger tube holders (for 12.7mm hole).