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This paper studies additive manufacturing oriented structural topology optimization with SIMP approach and aims at 3D high-resolution printable structural topology design with overhang and horizontal minimum length control for minimum compliance.To start with , we construct a hyperplane in ℝ4 by fitting a local element density distribution in the 18 Elements Scheme , use its gradient to estimate the overhang angle , the directional-dependent overhang angle and formulate the corresponding constraints .
 additive manufacturing, topology optimization, 3D, topology, design, overhang, local element density distribution, Elements, overhang angle, overhang angle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 additive manufacturing, topology optimization, 3D, topology, design, overhang, local element density distribution, Elements, overhang angle, overhang angle