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The best and most easy material from the hardware store is liquid latex rubber, if you add a white pigment it should dry up white, and is easily removable,
I am going to try that this week.

I must say the free scans give a better result, and I use the projected cross to keep the main part in focus, but when the final meshing is done, it seems to add all the sharper detail for the final mesh.
I have not got the idea that there are parts of the object out of focus, and you can always cut away unwanted parts in the segment you scanned before adding to the group scans.
OK so free scan is sharper? I don't understand the calibration part, in the manual it says if you move the scanner you have to calibrate again. But how often do you have to do this? If you go to free scan you also move the camera so what am I supposed to do?