Does "3d print" become verb in this sentence? Isn't it a noun?
Yes, in this case, "3D print" serves as a verb. This phrase is normally a noun, however in this case it is used as a verb for a lack of a better verb to describe the process of printing something in 3D. This is often the case for other nouns in English. When there is a lack of a good verb to describe something, the noun may be converted to verb form to serve as a verb.