additive vs subtractive processes printing motivations complexity access waste constraints failure resolution time cost materials PLA, PETG, PMMA, ABS, HIPS, ... ventilation design rules supports overhang FCStd jpg stl clearance FCStd jpg stl unsupported angle FCStd jpg stl overhang FCStd jpg stl bridging FCStd jpg stl wall thickness FCStd jpg stl dimensions FCStd jpg stl anisotropy FCStd jpg stl surface finish FCStd jpg stl infill FCStd jpg stl post-processing processes stereolithography fused-deposition molding extrusion contour crafting DED, WAAM ink-jet binder PolyJet cut sheets selective laser sintering CLIP two photon digital machines RepRap Ultimaker MakerBot Prusa MMU parts Sindoh Formlabs parts Objet parts MTM Precious Plastic materials Proto-pasta MatterHackers NinjaTek service bureaus print farms Shapeways Ponoko Additively Moog file formats STL ASCII solid object_name facet normal n1 n2 n3 outer loop vertex v11 v12 v13 vertex v21 v22 v23 vertex v31 v32 v33 endloop endfacet ... endsolid object_name binary 80 byte ASCII header 32-bit integer number of facets 50 byte facet records 32-bit IEEE floats normal vertices 1,2,3 2 byte attribute right hand rule normal (optional) (lack of) units PLY AMF 3MF OBJ, 3ds,DXFVRML, X3D FREP, BREP adaptively-sampled distance fields volumetric .vol, .tiff, .gif marching cubes fab modules vol_gif gif_stl gif_png G-codes non-planar paths software meshing MeshLab netfabb meshmixer Geomagic slicing ReplicatorG Skeinforge Slic3r Cura IceSL printing Printrun OctoPrint sharing Sketchfab Thingiverse scanning point cloud, triangulation, watertight, texture tomography Radon transform micro-CT scanned probe confocal serial sections opacity digitizer laser FabScan lidar array illumination time of flight vision photogrammetry ReCap PhotoScan VisualSFM SCANN3D 3DSOM Qlone AliceVision Meshroom COLMAP speckle OpenKinect ReconstructMe Skanect Sense iSense structured light laser pico-projector light stages SLAM assignment group assignment: - test the design rules for your 3D printer(s) individual assignment: - design and 3D print an object (small, few cm3, limited by printer time) that could not be made subtractively - 3D scan an object (and optionally print it)
