Use when translating an OpenRocket logical design into a physical component tree for FDM/SLA 3D printing. Decides per-component fate (print, fuse, purchase, skip), applies AM-specific geometry patterns, and emits componenttree.json.
Use when producing base geometry (tubes, cones, integrated fins, integral shoulders, motor mount wall thickening, full assembly) from a component tree via build123d. Pass 1 of the CAD pipeline — no holes, no pockets, no detail features (those are Pass 2, see modify-structures).
Use when applying detail features (holes, pockets, vents, mounts) to base STEP files already produced by generate-structures. Pass 2 of the CAD pipeline — reads modifications from the component tree, imports existing base STEPs, and writes modified STEPs back.