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    Using 2D scanning for fast feature extraction
    1. Scan the bottom of the mouse on the MFP scanner at a known DPI.  
    2. Import the scanned image into my CAD software as a background image.
    3. Scale the image to the true size.  (The image size and DPI gives you the actual dimension of the scanned image area. Use that to figure out the scale correction.)
    4. Create lines and arcs to establish key features.  (Use the circle-by-3-points method for the arcs.)  Bonus step: measure the tilt angle and use that to deskew the image.
    5. Create a polyline to trace the contour of the battery pocket 

    This technique of putting an item on the scanner can be a much faster way to design an object than to break out the calipers.