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Close to 2 million faces, high levels of subdivision surface modifiers, large textures 2K and 4k... all of that uses resources from your computer and eventually you will run out of them.
Read:
Why does Blender use so much memory for large textures?
Using 4k textures on something that will only be a few hundred pixels tall on the screen is wasteful.
Solutions:...
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If you need any to make any mesh in blender look "minecraft-like", use a Remesh Modifier set to Blocks. You can then export this to a variety of formats, including .obj. If you need a .vox file, however, you will need a special addon. One of the best I can find to suit your purpose is here, but I can not vouch for its efficacy.
Addon to export to ....
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Apply the scale of the low-poly object and it will work fine:
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I found that my selection of the baking options was the problem.
Initially I unticked everything except "Ambient Occlusion" (following a few online videos) - this left the primary baking type to "Combined", with direct and indirect light and Ambient Occlusion ticked.
Black bake.
I bounced around online for a while before going in to look ...
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