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Designing from a blank canvas can be an overwhelming project to take on. You might not get it right on the first try and may take you many versions to get you to the final CAD model you are happy with. Why not leverage knowledge from an existing object and learn from it which will make your work much easier and more accurate?
Reasons why to Scan
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for CAD
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Reference
It’s more efficient than designing from scratch
It gives you an accurate representation of the existing part to create the CAD model
It gives you the ability to insert design intention and fix problems or damage
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