Show HN: Nasscad – local-first 3D CAD for browser and Windows

NASSCAD V4.7.0 is a local-first 3D CAD tool for browser and Windows, with project saving, model import/export, interactive tutorials, and a NassScript editor for scripted demos. Its workflow supports selecting and editing objects, CSG operations, materials, and exporting all or selected shapes. STEP import handles AP203, AP214, and AP242; it can retain assembly organization, placements, colours, and supported PMI/GD&T annotations. Imported assembly structure does not restore original feature history, and exported files may not preserve every hierarchy level or annotation. For unchanged imported bodies, the Windows edition’s MEDUSA engine can reuse source B-Reps; edited or unavailable geometry follows other export paths, so users are advised to verify important exports in their receiving CAD tool.

The 26 October 2026 update adds previewable fillets and chamfers, improves curved-surface display, and fixes thin membranes that could remain after coplanar through-cuts in Boolean operations. Existing saved results are not recalculated automatically; users can rerun or deeply evaluate them, and should inspect holes from multiple views. Windows Setup and Portable packages bundle MEDUSA and its dependencies, while the browser edition uses Manifold WASM or an optional MEDUSA companion. The help also covers performance settings, cache clearing, logs, panel controls, and offline manuals. Windows MEDUSA starts and stops with the desktop app; browser users need no companion for basic Boolean operations.