It is likely that some areas of your object won't get scanned after the first pass because they weren't in the scanner's field of view (usually the top and bottom of the object). To fill in these areas you will need to re-orient the object so that the missing areas are in the scanner's field of view and run further scans. Repeat this process until all of the object has been scanned.
The image below shows the top of the object didn't can scanned during the first round.
To capture missing sections of an object:
4.1. Click the "Scan" button to enter the scan preview mode.
4.2. Re-position the object so that at least one missing area is now visible in the scanner preview window.
4.3. Repeat steps 2.4, 2.5, 2.7, and 2.8 from section 2 of this guide.
NOTE: Use the same settings you selected in your original scan (step 2.6), and do not move the turntable's position with regard to distance from the scanner.
4.4. Press the green "Start" button.
4.5. Align and trim the new family of scans as described in section 3 of this guide.
4.6. Repeat steps 4.1 - 4.5 above until the entire object has been scanned.