One of my puzzle designs has the property that all parts should be 3D-printed at the location where they are in the STL file. See http://www.shapeways.com/model/31897/connectivity.html
The object of this puzzle is to move five rings from the base of the frame to the top.
I read in one of the tutorials that the operator of the 3D printer sometimes separates parts for efficiency reasons.
However, if the rings of my puzzle are 3D printed separately from their frame, one can never get them on again. So such action/error by the operator will render the puzzle useless.
How do I flag Shapeways' 3D-printer operator that he/she should not separate the parts of this puzzle?