Separate facts from assumptions
Start with board dimensions, mounting-hole coordinates, component heights and cable access space. Give each dimension a source, unit and tolerance. Ask AI to identify missing inputs and assemble a parameter table. Do not let it guess material shrinkage or fit clearance: those values depend on the manufacturing process and require validation.
Build understandable dependencies
FreeCAD supports parametric modeling and geometry-constrained sketches. For a first enclosure, give board size, wall thickness, standoffs and lid dimensions clear parameter names. Build one feature manually before asking AI to help with repetition or explain a macro. Recompute after each change and inspect the affected features before adding more geometry.
Exercise the parameter boundaries
Vary board length, wall thickness and standoff diameter within their allowed ranges. Check recompute errors, intersections, fastener access and minimum wall thickness. Ask AI to propose a variant matrix, then perform the checks in CAD. Valid geometry alone does not prove that a connector can be inserted or that the lid will withstand its load.
Verify the delivered file
Save the editable model and parameter table. Export the format agreed with the recipient, reopen it and measure critical dimensions. For printing, inspect the model in the slicer; for fabrication, include tolerance requirements. Deliver the source, export, measured dimensions and a list of fit assumptions that still need physical confirmation.
Checks before accepting the result
A parametric enclosure is useful when dimension changes and their checks are repeatable.