Workflow
Turn a written requirement into CAD you can still reason about
Text-to-CAD works when the text carries engineering intent. PurCad preserves the function, critical sizes and uncertainty behind the generated geometry instead of reducing the request to a disposable mesh.
Write the interfaces, not just the noun
Say what the part touches, holds or clears. Include hole diameters and spacing, mating sizes, wall thickness, available envelope and manufacturing method. These details give the generator constraints that can be checked after the model is built.
Generate a draft, then narrow the change
Start with a bounded first version and inspect the named parameters. Follow-up requests should identify one incorrect feature, its relationship to the rest of the part and the required value. Each accepted change creates another recoverable version.
Trace the written requirement into the result
Sizes distinguishes user-provided values from model defaults. Parts shows the feature structure, while Check records whether the geometry and prompt obligations were satisfied. This makes missing holes or invented dimensions easier to catch than in an opaque final mesh.
Text cannot replace a missing measurement
PurCad can choose reasonable defaults, but it cannot infer an exact physical fit from an unmeasured description. Mark approximations clearly and measure interfaces before ordering hardware, machining material or printing the final part.