From 5mm to 200cm, you could get the raw offcial  STL/PLY samples from different type of 3D scanner, to find more, welcome to follow our official sketchfab and thingsreverse channal.

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Sketchafab: https://sketchfab.com/Thunk3D

Thingsreverse: https://www.thingiverse.com/thunk3d/designs