> We seem to have a bunch of engineers/scientists who can design
something
> in Pro Engineer and dismantle it on the screen 3D model, but the thing
is
> potentially not assemblable in real life because of the way they have
> designed bits to interlink.


VBG!  I've seen that, but fortunately not been on the receiving end. 
We did a major project with pro-e for molded parts, but the fellow doing
the design spent many years as a master toolmaker. (one who makes the
molds)

ZERO problems that way.




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