Summary

Remixed to isolate the watch stand. Thanks to [DIY_guy_3D] for original build!

Printed in Cura - Draft mode. No supports. See Pics.

It Works!

However, due entirely to my printing on lowest possible quality the result is a bit rough. I had a wad of thread inside the battery's circle seat, hard spot to sand smooth, so I just scraped it best I could (spend about 60 seconds on that :-) When I forcibly jammed the watch battery into the seat, the holder cracked (see pics.) But No Worries. Thanks to the sturdy 8mm width of these walls, that small crack hampers nothing.

I needed a watch stand asap. I got a watch stand asap. Thanks internet! Yr teh best!

Oh! And I recommend adding rubber feet to the bottom (https://www.amazon.com/dp/B06XCLYL53/) True for most all 3D printed table-top items. Just a heads up.