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An angle grinder will do the job without colouring the Ti as long as you take small bites don't dwell and let it cool. I'd tend to cut short of the line and work back to the line with abrasives (Roloc abrasive disks in an 90 degree die grinder is my weapon of choice) finishing off with lapping on a flat surface if the end needs to be really flat and square.
A manual hacksaw will work nicely on grade 1 or 2 (commercially pure) and just take a bit more dedication on grade 5 or 9. If your concerned with the tube flexing and preventing cut pressure how about making a quick wood buck to slide up inside the tube and support it. A couple of wood disks with some foam tape on the O.D. and a stick though the middle to go in a vice then slide on the tube and cut right over one of the the wood disks. Should allow you to support it without marring the outside too.
Might be worth mentioning 0.5 mm Grade 1 or 2 will cut using aircraft shears though the round shape might make that a tricky option.
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