Need some information about the dimensions od D&D minis

I just started working on a new project. I won't be ready to unveil it until I'm a bit further along in the process, but suffice to say it involves creating terrain for miniatures using a 3D printer. For the project, I need to know how thick the bases of D&D minis are, and whether the diameter is exactly 1 inch or little less. I'd measure myself, but I'm currently a couple thousand miles from my collection.

Thanks.

I don't have calipers for a precise measurement, but using simple tools it looks like the base is quite close to 1". (It might be a nominal 25mm.) The thickness seems to be quite close to 3mm (definitely a bit thinner than 1/8").