This is a thinner version of Sy's PegLock - Universal Caliper Mount Improved so the calipers sit closer to the pegboard. I had some issues modifying that model so I went back to the original. It's printed standing up. Due to the thinness and peglock cutout, there isn't that much contact with the build plate, so you may want to use a brim to ensure it doesn't come off during printing.
The author remixed this model.
Inspired by Vickash's model, I went back to the original by swiss_beluga, removed the holes, and made it just thick enough to subtract the Sy's Peglock template by Labrat_1023.