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Originally Posted by TheSilentChamber
I was going to run it though a ring roller.
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A ring roller will just flatten and kink the tube. You need to run it through a real tubing bender like this...

I don't know if dies will be available in the diameter you need though.
Does it HAVE to be copper? Galvinized conduit is easy to bend and it can be done with a hardware store tool.