Of course, you can use the STL design to subtract from another design. Is that not accurate enough for your needs? Measuring from point to point, or across a design isn’t possible. But you can always take a small slice of a design, and measure that using bounds.

OK. I archived what I could down load using the crappy tools from Google. I’m pretty peaved at the results. Obviously, Google thinks that a bunch of monkeys can write software to download web content. SIGH