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How to model a parametric part in a local PartMode browser with Partmode

Run PartMode on your own machine and build a constrained, editable 3D part in the browser.

Authorization notice. Partmode is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA mechanical designer or hobbyist who needs CAD without installing desktop software and does not want an account.

The problemDesktop CAD installs are heavy, and cloud CAD often requires sign-in before any modeling starts.

The outcomeA running local PartMode instance where the user has modeled a parametric part with constrained sketches and feature history.

What you need first

  • Node.js 22.13 or newer
  • git and npm available in a terminal
  • A PartMode account and a revocable agent key, only for hosted agent access
  • Validation of dimensions, tolerances, and materials for any real manufacturing use

Steps

  1. Run git clone https://github.com/BOMWiki/partmode.git and then cd partmode.
  2. Run npm ci, then npm run build.
  3. Run npm start.
  4. Open http://127.0.0.1:4401 in a browser and open an editable template.
  5. Edit a dimension, then confirm the rebuilt geometry and export STEP from the interface.

Prompt for your agent

In the BOMWiki/partmode repository, follow the local run steps in the README to start PartMode on http://127.0.0.1:4401, then report the URL that responds and the name of the template you opened. Verify that the server prints no build errors before reporting success.

Caveat. PartMode is engineering software and not a certification authority, so dimensions and materials must be validated before any manufacturing use.

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