Guitar picks and thumb picks
by adgaudio, published
The below openscad file can generate thumbpicks and guitar picks like shown in the picture. You can measure the diameter of your thumb to get a custom-fit thumbpick!
When printing, you may want to add a 4mm brim. This makes the pick very thin at the edges and also much larger (as shown in pictures).
The half-circle thumbpicks are pretty easy to make - either print a normal one and cut the top off, or modify the scad code.
I used openscad to design it and a caliper to measure my friends' thumb. Very straightforward.