Turn a polygon mesh into a CAD solid you can actually measure and edit. Planar regions and holes are recognised and rebuilt as analytic surfaces.
The lazy way to write a STEP file from a mesh is to wrap each triangle as its own tiny CAD face. The file opens, technically. Then your CAD has fifty thousand faces to draw, selection becomes a lottery and editing is out of the question.
StlWiz reconstructs instead: planar and cylindrical regions are detected and rebuilt as true analytic surfaces, so holes come back as real cylinders with exact circular edges and a flat face stays one face. Coplanar merging handles what recognition misses, and a faceted fallback guarantees you always get a valid closed solid rather than an error. The job metrics show which tier ran, the final face count and volume accuracy against your mesh.
Mechanical geometry reconstructs cleanly — that is what the feature recognition is for. Organic and scanned shapes cannot become tidy parametric CAD from any tool, and will come back as a valid but faceted solid.
The identical engine drives our STL to STEP converter; this page exists because plenty of pipelines hand you an OBJ rather than an STL.
Every converter runs the same geometry engine — see all 20 conversions.