Tis the season for outdoor decorative lights. Most spring clips will damage your tree branches or your wires or both. If you use twist ties to put up your lights or just wrap the wires around branches, they're ap ain to take down, and if you leave them up they will eventually cut into the bark. These clips hold the wire separately from the branch, can be printed in different sizes. I've also included a version that prints nested large and small clips to save bed space. Very loosely based on http://www.leevalley.com/US/garden/page.aspx?p=47452&cat=2,43319,33283

I printed these with a 0.75mm nozzle and 0.5mm layers and minimal fill. You may want to adjust the fill for stiffness with other settings.