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Fruit picking is a thing. You may want to 3D print some everlasting apples for tests.
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I've just now done exactly this. Model something (not an apple) not because I want to print it, but because I need to import it into CAD to check clearances etc. around it. I can abolsutely imagine modelling different sized apples if I was building an apple sorting machine.
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I do this all the time when working with stuff that is either perishable or expensive. I just print a 3D model of it and use that as a stand in for the real thing until I have it working.
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CAD is a 3D modeling tool.

its not the only one, and other tools are better suited for something like an apple. you can still post-process it to get it right sized for a printer

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Oh come on, a nice 3D model of parametric apples in OpenSCAD would be so neat to have.
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