why can't i mirror this surface?

i want to make model of a helmet but i can't mirror it as surf or as solid. please help

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3 Answers

use front plane as mirror plane, mirror bodies and uncheck merge solids. worked for me

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to keep it as one unit ( merged ) take a little off the plane first, it doesn't recognise a surface. then you can use mirror.
I have included 2 files PART and IGES.

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