I bought a Mitutoyo dial indicator to replace the shitty cheap one I had been using. I didn’t pay full price, getting it second hand from eBay – it didn’t come with a case.
If I didn’t get a case it would inevitably end up getting crunched on something or other, so I broke out Fusion and designed one.
The most interesting part of the case is the latch, designed both to print without support and to be springy so that it flexes open and shut.
I put a parametric version up on Printables for other people to use, but I’ve also used it myself to make various other derivatives.