How to prepare model for 3D printing?

To prepare a model for 3D printing it should have:

  • Readable format for printers: stl, obj, x3d, dae
  • Real world physics (reasonable size, weight distribution)
  • Must have enough wall thickness
  • Must be watertight - no holes in the mesh
  • Has large enough distance between tight areas (clearance)
  • Has correctly set separate and interlocking parts
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