This handy hanger is easy to fasten to the back of plaques or picture frames. The offset provides a space between the hanger and the back of the plaque for a nailhead. The sawtooth pattern allows horizontal adjustment. There is a small centerline that makes it easy to align the hanger with a centerline drawn on the picture frame or plaque. The hanger can be mortised into a picture frame with a 1/4" router bit.
Two versions of the STL is provided. One just has a single hanger, the other has four to save time in printing.
Print and fasten to the back of the picture using #4 (or 3mm) flat head wood screws.
I added the source file for Alibre Design. I'm not sure if that will be helpful, but here it is.