only a .4 ounce increases for a significantly stronger arm, I am considering drilling holes in strategic locations to shave off the other .4 ounces ,but keep the increase rigidity. Of course there is not need for the two bolts that were the hinges on the folding arm so that weight is lost as well. I will start measuring for the ESC and wire feed locations in the morning as the other two arms are printing of the total 6 needed for the upgrade.

Just for point of comparison this is a normal original equipment ABS molded arm that has no tilt for stability and no dual motor mount option.