Mapbox allows downloading of terrain DEM data (heightmaps) via their Tilequery API. You can then use QGIS to convert to STL for 3D printing.
Since the RenderDoc method is the most reliable "Google Map 3D Grabber download" workflow, here is a step-by-step guide.
To successfully "grab" 3D data, you typically need a combination of three specific pieces of software:
Google Maps 3D Grabber: Complete Guide to Downloading 3D Map Data
The hacking tools (RenderDoc) are Windows-only. On Mac, you can use Apple’s RealityKit debugger with Google Earth on iOS simulator, but it is extremely complex.
