i have an assembly. i want to create a thermocouple for theproduct. so i want to create a mold for the assembly.

i have inserted a new extrude part and edit it and use cavityoption but after selecting the parts and after clicking ok. it willdisplay error message it will result in a zero thickness geometry.

and operation fails..

now i use no of methods but can not find a suitable way to do themold cavity option.

please suugest what to do?
SolidworksAssemblies