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3D Printing Blueprints by Joe Larson

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Cleaning up bad geometry

Now, the model should be watertight, but it is hardly clean and non-manifold. Now is the time to locate, identify, and fix the non-manifold points:

  1. Clear the selected points (A).
  2. Select all non-manifold points (Shift + Ctrl + Alt + M).

Unfortunately in sealing the edges, non-manifold geometry was accidently introduced into the model. All of the currently selected points represent a problem in the model that should be fixed.

The first step is to remove any points that are occupying the exact same spot:

  1. Select all the points (A).
  2. Click on the Remove Doubles button in the left-side bar.
  3. When that is done clear the selection (A).
  4. Select the non-manifold points again (Shift + Ctrl + Alt + M).
  5. Choose one of the selected points and zoom ...

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