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* claim: #8139 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019FAWPuFoh9qxn2uS2j53QZ * 3MF export: a component's bodies as one object with parts (#8139) file.export and file.save_mesh wrote every body as its own 3MF object and build item, so a slicer loaded a multi-body part as separate objects and could arrange them apart on the bed. With objects: "component", each placed component that holds two or more bodies is written as one object whose <components> are its bodies' meshes, built once, so PrusaSlicer, OrcaSlicer, Bambu Studio and Cura load it as one object with a part per body, each of which can take its own filament. The design's own bodies, and a component with a single body, stay objects of their own. The default (objects: "body") writes the same file as before. - io: model_xml_parts and write_3mf_parts write the parts; export_with_parts maps body names to them. model_xml_with and export_with_quality give the same output as before. - engine: mesh_parts reads `objects` (component is refused for formats other than 3MF); component_parts groups the placed bodies by placement, each part named after its occurrence (Bracket:1, Bracket:2). - file.save_mesh passes the parts on when it also sends the file to a slicer; file.send_to_slicer's own folder export is unchanged. Fixes #8139. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019FAWPuFoh9qxn2uS2j53QZ --------- Co-authored-by: Claude <noreply@anthropic.com>