For ROB 311 (How to Build Robots and Make Them Move), I had the task of designing a straight lattice flexure object of any function for a homework assignment. I decided to design a wearable ring using Adobe Illustrator, to laser cut it out of plywood with the Glowforge. To create the design, I started out by measuring my finger with a piece of tape to get the measurements down. I designed a clasp on either end, with a rectangle enclosed in the middle. I then started with a small pattern of equally spaced and alternating notches on the bottom and top that leave a small gap in between them in the middle, and a single line that is centered, leaving space above and below it. My first try broke, so I went back and created a wider notch on the top and bottom to allow for more flexion, and it worked great! Here is how it turned out!
The cut plywood, before assembly.
The assembled ring - the lattice cut lets the plywood bend easily.
Top-down view of the ring.
Final product! Showing it off on the finger.