The first pic was a poor test print (had not dialed in my z-offset and the printer had to be re-leveled). The second pic is a near final version. Changes will be to have the screws sit flush to the top (they are already flush to the base), tweaking the opening for the USB-C connectors, and also opening up the holes which show the printing on the board so they can be more easily read.
Update 10/3/2020: The case is pretty much done, I just need to fix the method of securing a magnet in the outer case (the magnet helps hold the meter in the case, but is not really needed). Other than that everything seems to work OK with it. I have a couple more meters on order to check this against, in case there have been any changes to the design since I bought mine.
Update 10/23/2020: The case was finished up a day or two after the last update, and works great. The case closes nicely and seems secure with friction alone. I have a few more meters which I plan to case and either sell or give away as Christmas gifts this year.
Update 1/5/2021: I gave a few of these out as gifts this year, but did not try and sell them. Instead I posted it up to thingiverse here.