Thought this might come in handy for rollcage tube mitreing
http://metalgeek.com/static/cope.pcgi

[VERY]

VERY usefull. Wish I'd found it long ago...

don't forget though if printing out a profile that the thickness of the paper or card means that the 2 ends don't quite meet up, so allow for that.

it is a very helpful tool none the less.