I'm (hopefully) getting a G1X soon, so I think I'm going to put it to work printing this stuff out. I'm now excited for this as a use case and I kind of hope someone builds something to convert an existing factorio world into a 3d model, though it might be to big to actually print so maybe a way to take a section would be even better.

Blueprint would be easiest. Grep for printable entities, count how many you need and the grid extent.

https://wiki.factorio.com/Blueprint_string_format

(Also unrelated, I think by clearance they mean tolerance?)