Thanks also for your feed-back, much appreciated.

Concerning the auto-align, my trials have been unsuccessful so far, but i did not know we had to overlap the scans by 1/3 !!
Hopefully this is the solutions to my problems. About the "obvious features", does it help if i stick some black crosses on my part ?

Concerning the export to other file format:
when we save a scan, we can choose between STL but also another format, which saves XYZ coordinates, is this the point cloud ? Which format is this ? .ply ?

Not everyone is printing what they are scanning. Myself i design other parts around what i scan. So it's a must to be able to import the file into a CAD software, STL is one format, but there are others.

thank you,