James, Roost designer, here. Happy to chat modulus, moments of inertia, design/analysis tools, best 3D printed materials, MIL-Specs, slip fits, molding shrinkage/theory, etc.<p>3D printing is an absolute game changer, but I've found to make it work to your best advantage in validating and removing uncertainty from your design, it takes a thought-thru approach. The good thing is prints are relatively cheap, and you do always learn by breaking things :)