domain: openscad.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Write or obtain a parametric .scad file exposing top-level variables intended to be overridden at export time.
Run openscad -o output.stl -D 'variable=value' -D 'other=123' input.scad to render and export in one non-GUI invocation.
Pass multiple -D flags for multiple parameter overrides, quoting string values carefully since the shell can strip quotation marks OpenSCAD needs.
Specify --export-format asciistl or --export-format binstl explicitly if a particular STL variant is required, since CLI and GUI defaults differ.
Check the process exit code and stderr for CGAL/geometry warnings, which can indicate non-manifold or degenerate output even when a file is produced.
Known gotchas
CLI default STL export is ASCII while the GUI defaults to binary — pipelines expecting one format can silently receive the other unless --export-format is set explicitly.
-D only overrides top-level variables declared as simple assignments in the script — it cannot reach into modules/functions not exposed at the top level.
Complex parametric models can be slow or memory-heavy to render headlessly; long-running batch jobs should have timeouts and a manifold-check validation step.
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