This support arm is intended to be used with the original base and stem from Divideby0 and to fit a 3.0L Camelbak bladder without resting weight on the inner/center bladder support.
I printed in PLA following the manufacture's print settings. Three wall/perimeter, gyroid infill at 15%, .04n, and 0.20mm layer height.
The author remixed this model.
I redesigned Divideby0's support arm model entirely in Fusion 360 starting from scratch except for the general layout of the original design. The support arm is taller and has more arms. The support arm uses the original base and stem. This model is designed to not rest against the inner/center support web of 3.0L Camelback bladder. Fillets are added to mitigate pressure points on the bladder. The feature which is inserted into the stem has much less surface area than the original design. I glued my stem to the support arm to increase rigidity and have had good luck thus far.