I bit the bullet and decided on pultruded carbon fibre arms. It's probably overkill but they happen to make them in 6mm OD 4mm ID and at a reasonable cost. It was less than AU$20 for 2x 1 metre lengths of it. Just wasn't too fond of the aluminium tube I had... There's a good chance they might have been fine, but I think over time they may have suffered fatigue with those thin walls, especially if I added a heated bed or something that would have seen a wide range of temperatures. Carbon fibre should be a bit more resilient, I think...
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