nurb

nurb is a conversational CAD app for 3D printing: describe the part in plain words and the AI models it in a live viewer, with a slider for every dimension, while printability rules check the solid and the slicer reports time and filament cost up front. Parts are true B-Rep solids on the OCCT kernel, and export defaults to 3MF with the print settings the part justifies already embedded, with STL, STEP and GLB one click away.

Thirteen printability rules run against the exact solid, not an approximation: overhangs, thin walls, floating islands, warp-prone first layers and parts that tip over, with findings pinned to the exact faces they fired on. The viewer's print time row drives the user's own OrcaSlicer or Bambu Studio install and answers in minutes and grams.

The chat runs the agent the user already has, Claude Code, Codex, Gemini, Cursor or Grok, on their own subscription, and modelling, checking, viewing and export all run locally with no nurb account. Dimensions that matter are recorded with how they were measured, and nurb refuses to let the AI guess them: a guess has to be marked as one until somebody measures with a caliper. The license is FSL-1.1-MIT, source-available for any purpose except building a competing product, converting to plain MIT two years after each release.