Creating custom city model of my neighborhood

I want to create a city model similar to the ones on Maker World like this one: New York City Midtown Manhattan Mini v2 by jarvizar - MakerWorld

I want to make a custom model of my neighborhood, specifying an exact area of buildings and streets. I was able to create an STL of this in Blender using data from Google Maps - you can access it here.

But that model won’t print, because it is full of non manifold edges. I’ve tried several STL repair softwares but none can fix it. I suspect it’s not fixable because the Blender/Google Maps process is not designed for printing and it leaves hundreds or thousands of non manifold issues in the model.

So, I wonder what other methods there are for creating these type of city models for printing, allowing for specific locations.

I appreciate any advice - thanks!

There is a video on youtube that explains the process.

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Thank you! This was helpful. I ended up using my original larger model which used the Google Maps Blender add-on with API key, and then imported into Fusion which was able to automatically remove all the non manifold - it took a long time but it worked!