Here I created a clip for a hutch/shelf on my desk. I needed something to hold schematics off my desk. I used a target holder from https://www.printables.com/model/862705 (Thank You) and super glued the target holder to the clip. The space is 20mm in between the clip, then I took my heat gun to bend it slightly to fit more snug on the shelf. Feel free to adjust yours anyway you like.