3D Model: Design A Minimal 3D Model With A Flat Hexagonal Base Measuring Exactly 18mm From Vertex To Vertex And 1mm In Height. On The Top Surface Of The Base, Place A Capital Letter 'C' Lying Flat, As If Engraved, Printed, Or Slightly Embossed Into The Surface. The Letter Should Be Centered, Not Standing Upright, And Should Not Protrude Above The Base Height. The Model Must Remain Clean, Proportionate, And Suitable For 3D Printing