Hey builders,

A model that looks right is not necessarily a model that still works after one number changes. That is where parametric CAD earns its keep: the design has a memory of why it has that size.

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Every Wednesday: one tool under the hood, one useful build, three supporting tools and an honest comparison. Today’s rule: a pretty model is a draft; a rebuilt model is evidence.

SolidCraft is an open-source parametric CAD app written in Rust. It runs on desktop and in a browser, and its command layer can also be driven from a CLI or an MCP server. The Oct. 13 v0.7 release fixed stacked-extrude sketching, added modelling and export fixes, and documented a format change. A Show HN thread has already pulled in builders arguing about what an agent-driven CAD workflow should actually verify.

The useful bit is not “AI makes a part.” It is the parameter timeline: dimensions can be model parameters or named expressions, and changing one can rebuild everything that depends on it. A shape can export successfully while a later edit still exposes a broken assumption. The project’s own docs are candid that it is early; surfaces, drawings, CAM and simulation remain deferred.

Access: the browser sample is free and needs no account. If WebGPU is fussy, the docs say ?webgl forces WebGL2. MCP is optional and requires a local CLI plus an existing compatible client; skip it for today’s build. MCP tools can change or export files, so never grant broad paths or auto-approve a design you have not inspected.

Who it’s for: builders making a small enclosure, bracket or fixture—and teams that want a repeatable way to check a size change. My take: this is promising because the same command path can be clicked, scripted or handed to an agent. But a fast-moving CAD project deserves small, reversible tests, not a blind production run.

Verdict: 🔨🔨🔨 (3/5 — a sharp open experiment; verify every rebuild before manufacturing)

Today’s term: parametric model

Plain English: It is a recipe, not a sculpture. Change “two cups of flour” to three, and every part of the recipe that depends on it adjusts.

Why you should care: Parameters make a design’s assumptions visible—and give you one place to test them before a bad size spreads.

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💬 Reply REBUILD with the first dimension you would make explicit.