free toolpart of the eitri suite

eitri CAD

Parametric CAD parts and assemblies, measured on every build, exported as STEP, STL, 3MF or GLB.

Cross-checked with Wires Motion in the combined workspace.

Describe a part.

Free · $4 of agent usage a day · sign in with GitHub

Measures what it builtEvery hole, wall, clearance and collision, on every build.
Fixes the geometry, not the checkA failing check is fixed in the model; the agent is told never to delete or loosen one.
Parametric, and yours to editbuild123d models you keep editing by hand or by chat.

↔WiresThe cable fits the hole it is routed through, and the connector has room to plug in.
↔MotionA mechanism's masses come from these CAD bodies, and its parts are checked for collisions as it moves.

22 / 22tasks solved (Claude Code with the text-to-cad plugin: 20 / 22)

~89 sper task on average

~$0.24per task at API prices

every buildmeasured: holes, walls, collisions, mass

Run by eitri's authors, each task once, judged by Claude: strong evidence, not independent proof. Every check's verdict.

Watch a recorded session (20 s)

The first build fails the thinnest-wall check, eitri finds the cause and rebuilds, all 10 checks pass. 3 min 17 s of work in 20 s.