{
 "measured_on": "2026-10-13",
 "question": "whether cutting a model into pieces that fit a printer bed leaves each piece closed and solid, by method and by input",
 "tool_versions": {
  "prusaslicer": "2.9.6",
  "blender": "5.2.2 LTS",
  "trimesh": "5.1.0",
  "numpy": "2.5.2",
  "manifold-3d": "3.5.4",
  "three-bvh-csg": "0.0.18"
 },
 "units": "millimetres",
 "bed_mm": [
  256.0,
  256.0,
  256.0
 ],
 "margin_mm": 5.0,
 "method": {
  "grid": "pieces per axis = ceil(size / (bed - margin)); planes at equal divisions of the bounding box; every method gets the same planes",
  "prusaslicer": "prusa-slicer-console --cut Z --dont-arrange --export-3mf, one plane at a time; for X and Y cuts the coordinates are swapped cyclically so that axis is Z, then swapped back",
  "bisect": "Blender bpy.ops.mesh.bisect with use_fill=True, two bisects per cut axis per cell, then triangulated for STL export",
  "boolean": "Blender Boolean modifier, Intersect, Exact solver (the default in 5.2.2), against a box the size of the cell; outer cells padded by 5% of the model diagonal",
  "boolean-manifold": "as boolean, with the modifier's Solver set to Manifold",
  "tool": "3dtoolwiki.com/free-tools/split-stl#cut in headless Chrome (puppeteer-core, SwiftShader): upload, printer 'Bambu Lab A1, P1S, X1C', default 5 mm margin, Cut, Download ZIP",
  "manifold_library": "controls only: manifold-3d Manifold.splitByPlane in Node, the same call the tool makes, at a chosen position",
  "controls": "one cut through the robot, either exactly on the plane in question or 0.5 mm away from it; vertices_on_plane counts input vertices within 1e-9 mm of the plane",
  "watertight": "trimesh is_watertight after merging coincident vertices: every edge used by exactly two faces",
  "prusaslicer_info": "prusa-slicer-console --info on each piece; manifold and open_edges as it reports them",
  "strays": "connected pieces with under 1% of the faces of the largest one in the same file",
  "volume_kept_pct": "sum of the pieces' signed volumes over the input's volume; only for closed inputs",
  "slice": "prusa-slicer-console --export-gcode with default settings, bed 256 x 256, max height 256; filament_mm read from the G-code",
  "generated_input": "public/samples/split-stl/generated-figurine.stl scaled uniformly to 300 mm tall; it is a TRELLIS.2 generation from the scale benchmark, welded and decimated to 60,000 triangles",
  "remesh": "Blender Remesh modifier, Voxel mode, voxel size 2.0 mm, on the scaled generated input",
  "wall_probe": "rays along X and Y through the centre of the bounding box; gaps_mm are the distances between consecutive surface hits"
 },
 "inputs": {
  "robot": {
   "file": "robot.stl",
   "faces": 39534,
   "bbox_mm": [
    310.0,
    152.5,
    430.0
   ],
   "watertight": true,
   "prusaslicer": {
    "number_of_facets": 39534,
    "manifold": true,
    "number_of_parts": 1,
    "volume": 7226292.5,
    "open_edges": 0
   },
   "volume_mm3": 7226289.8,
   "grid": [
    2,
    1,
    2
   ],
   "planes_mm": {
    "x": [
     0.0
    ],
    "y": [],
    "z": [
     215.0
    ]
   }
  },
  "terrain": {
   "file": "terrain.stl",
   "faces": 37998,
   "bbox_mm": [
    420.0,
    370.0,
    137.4
   ],
   "watertight": true,
   "prusaslicer": {
    "number_of_facets": 37998,
    "manifold": true,
    "number_of_parts": 1,
    "volume": 10654914.0,
    "open_edges": 0
   },
   "volume_mm3": 10654941.6,
   "grid": [
    2,
    2,
    1
   ],
   "planes_mm": {
    "x": [
     0.0
    ],
    "y": [
     0.0
    ],
    "z": []
   }
  },
  "generated": {
   "file": "generated.stl",
   "faces": 60000,
   "bbox_mm": [
    198.4,
    188.8,
    300.0
   ],
   "watertight": false,
   "prusaslicer": {
    "number_of_facets": 59972,
    "manifold": false,
    "open_edges": 86,
    "number_of_parts": 0,
    "volume": 101501.5
   },
   "volume_mm3": null,
   "grid": [
    1,
    1,
    2
   ],
   "planes_mm": {
    "x": [],
    "y": [],
    "z": [
     150.0
    ]
   }
  },
  "generated-remeshed": {
   "file": "generated-remeshed.stl",
   "faces": 117988,
   "bbox_mm": [
    198.1,
    188.4,
    299.8
   ],
   "watertight": true,
   "prusaslicer": {
    "number_of_facets": 117988,
    "manifold": true,
    "number_of_parts": 1,
    "volume": 2978213.5,
    "open_edges": 0
   },
   "volume_mm3": 2978214.9,
   "grid": [
    1,
    1,
    2
   ],
   "planes_mm": {
    "x": [],
    "y": [],
    "z": [
     149.913
    ]
   }
  }
 },
 "generated_wall_probe": {
  "generated": {
   "area_mm2": 344145,
   "signed_volume_mm3": 101487,
   "rays": [
    {
     "axis": "x",
     "hits": 4,
     "gaps_mm": [
      0.63,
      196.75,
      0.6
     ]
    },
    {
     "axis": "y",
     "hits": 4,
     "gaps_mm": [
      0.76,
      135.44,
      0.64
     ]
    }
   ]
  },
  "generated-remeshed": {
   "area_mm2": 158873,
   "signed_volume_mm3": 2978215,
   "rays": [
    {
     "axis": "x",
     "hits": 2,
     "gaps_mm": [
      197.8
     ]
    },
    {
     "axis": "y",
     "hits": 2,
     "gaps_mm": [
      137.65
     ]
    }
   ]
  }
 },
 "remesh_trials": [
  {
   "voxel_mm": 0.8,
   "faces": 1390972,
   "prusaslicer_manifold": true,
   "prusaslicer_parts": 99,
   "volume_mm3": 67087.2
  },
  {
   "voxel_mm": 1.0,
   "faces": 815076,
   "prusaslicer_manifold": true,
   "prusaslicer_parts": 1000,
   "volume_mm3": 46070.6
  },
  {
   "voxel_mm": 1.5,
   "faces": 286332,
   "prusaslicer_manifold": true,
   "prusaslicer_parts": 4440,
   "volume_mm3": 32776.4
  },
  {
   "voxel_mm": 2.0,
   "faces": 117988,
   "prusaslicer_manifold": true,
   "prusaslicer_parts": 1,
   "volume_mm3": 2978213.5
  },
  {
   "voxel_mm": 3.0,
   "faces": 51624,
   "prusaslicer_manifold": true,
   "prusaslicer_parts": 1,
   "volume_mm3": 2978691.8
  }
 ],
 "runs": [
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   "seconds": 1.09,
   "summary": {
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    "open_edges_prusaslicer": 83,
    "boundary_edges": 14,
    "nonmanifold_edges": 53,
    "stray_components": 36,
    "fits_bed": true,
    "volume_kept_pct": 100.0,
    "pieces_sliced": 4,
    "filament_mm": 784238
   },
   "pieces": [
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    },
    {
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    },
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  {
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   "counts": [
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   "volume_line": "Volume kept: 100.0% of the original.",
   "page_errors": [],
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    "pieces_prusaslicer_manifold": 2,
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   "vertices_on_plane": 0,
   "method": "manifold_library",
   "seconds": 0.1,
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    "pieces_prusaslicer_manifold": 2,
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    },
    {
     "file": "x1-y1-z2.stl",
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     "signed_volume_mm3": 3253186.4,
     "prusaslicer": {
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  }
 ],
 "not_measured_here": [
  "The cut tools in Bambu Studio, OrcaSlicer and the PrusaSlicer graphical interface, including their connectors (plugs, dowels, snaps). They have no command line equivalent; what the article says about them comes from their documentation.",
  "Whether PrusaSlicer's graphical Cut tool behaves like its --cut command line option. They may share code, but that was not checked.",
  "Physical prints, glue joints and how well pieces line up. Nothing here was printed.",
  "Models other than these four. One generated model is one generator on one image."
 ]
}