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A Christmas light hook that can be connected directly to the soffit for downward facing lights. These work for soffits that meet with a channel lip at 90 degrees, like the one shown below. They were designed for “LED Vintage C9 bulbs”, but they'll likely fit many others as well.

Instructions

1. Print the “Size Test Plate”, which includes one of each size (standard, medium, deep).
2. Test each size on your soffit. If your soffit is tight with no gap when you push on it, the standard clip should be fine. If its very loose with a large gap, you might need the deep clip.
3. Print the ‘bulk’ profile for whichever size you need.