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Re: pic: 1123 Frame
80/20 and the 30mmx30mm Bosch extrusions both make wonderful tools for prototyping (for frames and lots of other stuff). But, as pointed out, it is very heavy stuff. Use it for designing your frame, locating parts, and validating the everything will fit. But when you have done that, replicate the structure with welded aluminum square tube for your final robot. You will have an even more rigid structure, and will lose at least 1/3 of the weight (or up to 1/2 if you have used a lot of the stock faseners).
-dave
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