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This is a working visual prototype. STL, STEP and IGES files are all parsed and measured for real, entirely in-browser — the OpenCascade geometry engine (WebAssembly) is embedded directly in this file, so there's no external network dependency for parsing. Volume, surface area and overhang come from the actual mesh; wall thickness is a simplified estimate. Production pricing still runs the file through the OpenCascade server-side service already agreed.