How to convert a working physics model into printable model

[jumpjack]

To get accurate simulations of moving parts, you must split each part in parts as small as possible, as the algorithm has to process each one of them looking for collisions.
But, once you eventually get a working model, it is no more printable, due to multiple overlapping faces.
Does it exist a plugin which completely deletes all overlapping faces?

Example:
https://3dwarehouse.sketchup.com/wareho ... ea058dbe1e