I was having difficulty printing the Caribiner designed by briscoe28 at a small scale, so I designed my own. The clearance on the clip is perfect and doesnt require any cutting or snapping, and the Carabiner is very strong, haven't broken one yet. Prints in about 6 minutes (on low resolution) on a Makerbot Rep2x. There is a step on the bottom side, print with this side down to eliminate having to "deburr" your part after printing.