This is a micrometer stand and holder with variable angles of the tool. You can set the angle with a knob.

Inside the fixing there are two TPU (or rubber) surfaces to care your micrometers covering.

BOM for the knobs:

see BOM list

The two threads must be cutted manual into the parts (you need thread cutting tools for M10)

I printed from blue “metal” textured PLA and it looks like the original casting iron holder. :) If you need more resistance, you can use PETG, ASA or some other industrial filament.