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I'm a blender beginner. I have an .STL of an anatomical figure and I need to crop a small chunk of it and export it in a separat .STL file, but so far I haven't found anything quite relevant on the web. Since I'm a blender-nobb, I figured out I don't even know what to search for exactly.

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  • $\begingroup$ What do you mean by "crop"? I'm only familiar with that term in a 2D setting and I see a couple different ways it could apply here. $\endgroup$ – Gwen Apr 24 '16 at 0:30
  • $\begingroup$ I have a maxilary 3D scan and I need to select a tooth and export it in a different STL in order to create a few different final STLs with that tooth in different positions from the original one (either rotated or moved a few mm right or left). $\endgroup$ – dvsn Apr 24 '16 at 7:24
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Have you tried looking into the Boolean modifier?

If you object is a closed, watertight, manifold mesh you could use Boolean operations to break it into chunks of the desirable parts.

Just create a new closed watertight mesh object that as a shape or volume that engulfs or includes the part of the STL you want to keep and use it in a Boolean operation to intersect with the existing mesh and extract the part you want.

You can also try the Knife Project operator if a simpler cutting or slicing of the original geometry in one direction will suffice to obtain what you want. You can use something as simple as a plane or a bezier curve to cut your geometry in the desired way.

Curve knife project

Edit If your object is already composed of separate parts but all joined in a single object you can simply enter edit mode, select them all press P to separate them and select the option All loose parts to divide them into different objects.

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