This is an holder for a dial indicator. I did it for my Creality Ender 3. I use it for a Fowler, but any brand should be compatible. I'm form Canada, so the indicator is in Inches, but there are metric versions too.
To use it correctly, you will need 2 bolts and 2 nuts 1/4-20 or 1/4-28 or M6. I would recommend to use washers, it will damage less the indicator.
I designed it on OpenSCAD, so you can modify all the dimensions, if it doesn't fit on your machine.
I hope you like this and you will print it and enjoy it as much as I do.