Hi all, I just bought the thinnest 15mmx15mm alu tubing at my hardware store. Thickness is 1.5 mm.. But now I realize that's probably way to thick and it should be 0.5mm?
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I was just shopping for the same thing, and could not find aluminum square tube locally. Then I remembered what I had learned on DIYDrones - Look in the bathroom design section of a Home Depot or hardware store for aluminum towel bars. They sell them without the end caps so you can mix and match. I just bought two sets - two 24" and two 18" - so i can experiment with different size arms. They are very thin and light.
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http://www.homedepot.com/Aluminum/Bath-Bath-Hardware-Bath-Accessori...