Meshmixer

Meshmixer is a free software application for working with triangle meshes. It can be used to clean up 3D scans, prepare models for 3D printing, or design objects that fit other objects.

The tool includes a range of features such as drag-and-drop mesh mixing, 3D sculpting, surface stamping, robust convert-to-solid for 3D printing, 3D patterns and lattices, hollowing with escape holes, branching support structures, automatic print bed orientation optimization, layout and packing, advanced selection tools, remeshing and mesh simplification, smoothing and free-form deformations, hole filling, bridging, boundary zippering, auto-repair, plane cuts, mirroring, booleans, extrusions, offset surfaces, project-to-target-surface, interior tubes and channels, precise 3D positioning with pivots, automatic alignment of surfaces, 3D measurements, and stability and thickness analysis.