These are little brackets to make it easier to mount strings of festive lights on your house. The first one installs in vented soffit panels. Pinch the two "horns" gently to fit in a couple of the soffit vent holes and let it spring up to mount. (Some vent patterns are different, your mileage may vary.) I intentionally designed them without a latch so they're easy to remove & reposition.

The second bracket can be mounted with a #4 or 3mm flathead wood screw.

Once mounted, the cord for the light string slips through the gap in the ring. For lots of lights, 4 or more strings should fit. I space them about one every foot.

I designed them in ViaCAD Pro.

Because the rings are fairly narrow (2 mm square cross section), the default shell settings didn't work very well on my Thing-O-Matic. I went in to the SkeinForge parameters and set all Extra Shells parameters to 0, which seems to work.

I found this article very helpful: http://www.makerbot.com/blog/2011/05/31/untangling-skeinforge-shells/

If anyone has a better set of parameters, please let me know, there are a scary lot of knobs to tweak there.

The ToM automated build platform is very useful for this, as you'll probably want a couple dozen or more. I can print about 8 of the small brackets per hour and 4 of the screw mounted ones in an hour.