This document summarizes research on 3D printing and additive manufacturing techniques for polymers. It discusses several common 3D printing methods like fused deposition modeling, stereolithography, digital light processing, selective laser sintering, three-dimensional printing, laminated object manufacturing, and PolyJet technology. It also reviews studies evaluating the mechanical properties of 3D printed parts under different loading conditions and the effects of fillers and post-processing on mechanical properties. The goal is to understand the strengths of 3D printed parts for practical applications and facilitate standardization of mechanical testing methods.