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CAD checking, manufacturability, and engineering intelligence.

February 9, 2026

What Is an Open Shell (Non-Watertight) in CAD (and Why CAM Fails Because of It)

An open shell (non-watertight) is one of the most common geometry issues that breaks CAM, meshing, and vendor quoting. Learn what it is, how it happens, and how to detect it visually in STEP and IGES files.

Knife Edges in CAD: The Geometry Error That Breaks Toolpaths

Knife edges are thin, zero-thickness features that cause CAM, meshing, and manufacturing failures. Learn what they are, why they happen, and how to detect them visually.

Why CAM Toolpaths Fail After Export — And How It Extends Your Timeline

CAM toolpaths fail because of export artifacts like open shells (non-watertight) and topology gaps. Learn how to catch geometry issues before manufacturing and prevent prototype delays.

Onshape to STEP: Common Geometry Errors After Export

Onshape exports can look correct in CAD but fail downstream after STEP handoff. Learn common export-related geometry issues and how to catch them early.

Vendor Rejected My STEP File — What Went Wrong?

Vendors often reject “valid” CAD exports due to hidden geometry issues. Learn the most common causes and a quick checklist before you send files out.

Fusion, SolidWorks, Onshape: Why Geometry Errors Survive Export

Neutral file translation (STEP/IGES) can introduce subtle geometry faults across CAD tools. Learn why it happens and how to detect issues before manufacturing.