Check out http://www.thingiverse.com/thing:988513 for an improved version of this capo. No fiddling with screws and levers - this one-piece capo clips on with one hand. The presser bar is contoured for a radiused fretboard. Don't have a guitar? Print these for your friends and they'll stop laughing at you for being a geek! (Or, just print your own guitar: http://www.thingiverse.com/thing:710561) Update: In the original STL file, the spring could break if you tried opening the capo too far. I made some minor tweaks so that the spring bottoms-out before breaking. Use this file current file capo_c.STL instead if you've downloaded an earlier version. Printing Tips: