1) The clips are the biggest problem. You can print 230X225 if the object is *not* square and doesn't cover those gray areas where the clips are. So you are correct. The older (recent) versions of cura wouldn't let you get anywhere near the clips - I believe Cura is getting smarter about all that.
2) The next problem is for large parts you usually need a large brim. The eats into your print dimensions. However usually you only need a brim on the corners.
I have also had people from 3dhubs send me something that is 230mm wide. Fortunately it was skinny enough in the other dimension that I could rotate it 45 degrees. Unfortunately that means for a different shaped infill but it's probably just as strong. I hope.
I always play around in cura with their object before accepting the print job - often I need them to fix something that is too skinny to print (e.g. thin walls).
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anon4321 16
The first question is can you verify the printer can physically move throughout the whole range?
Just because Cura won't slice the maximum volume doesn't mean the product page is wrong.
I don't have a UM2, can you manually move the axes? If so start at the home position and verify the product specs match the printer's physical capabilities.
If so then we can work on why Cura won't slice the max volume.
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