3d Print Modeling · m-esm bundle Author and iterate on 3D-printable parts as parametric Python (trimesh + manifold3d + shapely), then view and screenshot them headlessly to verify. Use when the user wants to design, modify, or print a mechanical part, gear/worm drive, enclosure, bracket, or any FDM/resin model, anything involving STL/3MF/GLB, build123d-style geometry, watertight CSG, or "make this part / make it bigger / make it printable". Also when the user asks to cut/split/section a model for the bed or reassembly (slicer-style cut + plug/dowel/snap/dovetail connectors in CAD). Covers the view-screenshot-iterate loop and FDM design rules. For Bambu .3mf slicer export see the bambu-3mf-export skill; for importing STEP/IGES/foreign CAD see foreign-cad-import.