Sunglasses Arm

When one of the arms for my sunglasses broke, I designed new ones for it. Understand that while this model really isn't intended for human consumption, there's no reason not to share it. I've included an image of the style of hinge this is designed for. It is not parametric.

You'll notice in the photo, one arm is grey, while the other is green. The grey is ColorFabb PHA, while the green is some cheap generic PLA. The green was printed recently, after the left grey arm broke after a few months of use.

Originally, I printed these vertically, so support material couldn't mess with any of the inner surfaces or tolerances I designed to, but that creates a weak section where a small cross sectional area meets a larger cross section, right on a layer transition. This is why the left arm broke on the first pair. The green arm is printed lengthways on the plate, with Meshmixer's supports (I did not include the baked support version because you can probably do better, this was intended as a test). This should mean the stress isn't applied directly to a seam between layers.

I've included one fully designed right arm, the art-deco look of it is actually intended to reinforce the design a bit, on some very thin sections of plastic, and I've also included just the sleeve section that goes over the hinge, as a base for your own designs.