**UPDATE:** I will post additional configurations, since I forgot to take some widths from my caliper into consideration. However, this mix might be OK for you as-is (or for another tool of comparable size). --- One of the first things I printed after getting my Ender 3 Pro was marcgsc's [tool holder](https://www.thingiverse.com/thing:4682962). I had hoped that his knife slot was large enough to slide my digital caliper into, but it was too small. So, I tweaked that slot to fit a larger tool.