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I want to ask question about 3D printing .
Can 3D printing be used in mechanical engineering ?

Here is the answer for How Plastic Injection Moulding Design Works :

Which polymers are best for plastic injection molding?

All thermoplastics, like polyethylene, polypropylene, polystyrene and...

Really felt good reading to your comment. Also you have made your point. One should look for skills and capabilities rather than judging from gender point of you.