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how to do the thickness analysis of a part in pro|engineer?
I think you don´t have that option. Creo has a analysis feature for that but work with slices and ranges, not intuitive at all.
External applications for that:
http://dfmpro.geometricglobal.com/dfmpro-for-creo/
http://geomcaliper.geometricglobal.com/downloads/creo-parametric-proengineer/?pid=271