Sunglasses Clip

thingiverse

Clip a holder to your car visor and it will securely hold your sunglasses in place. After my current clip broke, I decided to create an improved version that would withstand heavy use. One thing to keep in mind is that this item requires additional materials and assembly, including some 14-gage spring-steel wire (1095 or the equivalent) for the visor-holder wire, a short length of 12-gage wire for the hinge, and some neoprene rubber glued into place to hold the sunglasses firmly centered. All parts have been designed separately to facilitate building and provide clear dimensional guidance. I assume that one day, 3D printers will be able to print foamed-rubber, various metals, and then something like this would be a simple one-shot production, but for now it's an assembly process. My major innovative change is to improve the durability and strength of the clasp, which is the primary failure point of the device, through use of a flexure-based design and generous use of filets that avoid sharp 90° corners, which act as stress-concentrators and tend to be where breaks propagate. Here's an example of this kind of clip you might find in any corner gas station: