A design objective to minimize part mass while meeting structural, thermal or functional requirements: enabled in AM through topology optimization, lattice infill and thin-wall strategies not achievable with conventional processes.
Lightweighting exploits AM's geometric freedom to place material only where stress demands it. The three main levers: (1) topology optimization removes voxels below a stress threshold; (2) lattice infill replaces solid volume with open-cell struts at 10–40% relative density; (3) thin-wall hollow shells replace solid blocks. Mass savings of 40–75% vs. machined equivalents are commonly reported for metal AM parts in aerospace.
Aerospace is the primary domain: titanium brackets, UAV structural frames, satellite panels. Medical implants use porous titanium lattices to match bone stiffness (avoiding stress shielding). Automotive uses AlSi10Mg DMLS brackets where each gram saved multiplies into fuel savings over vehicle life. SLS/MJF nylon parts for robotics benefit from hollow shells with internal rib grids.
Ultra-light walls can fail post-processing: thin DMLS parts are brittle before stress-relief. Hollow SLS parts trap powder (add drainage holes ≥ 5 mm). Lightweighting that drops below the technology minimum wall (0.5 mm DMLS, 0.7 mm SLS) yields defective or unsupported surfaces: verify against dfam.dmls.wall_thickness and dfam.sls.wall_thickness rules.
Related terms: Topology Optimization, Lattice & Gyroid Structures, Design for Minimal Material, Part Consolidation
| Theme | optimization |
|---|---|
| Also called | weight reduction, mass optimization, lightweight design |
| Source | Wiki/concepts/dfam.md, Wiki/tech/dmls.md |
Engineer, author of The Big Book of 3D Printing and additive manufacturing expert