@AAAhmed made a terrific “digital caliper holder” model, however, it wouldn't quite fit my model from Johnson Level. This one works quite a bit better for the 6-in-1 model (sold at Lowes, and maybe other places).
The author remixed this model.
Reduced the height of the rightmost support to provide more clearance for the tension knob on the calipers.
Print with supports on (it's just for that one little area - easy to remove). I would recommend 3 wall loops and 10% gyroid infill as well.