Thingiverse link: http://www.thingiverse.com/thing:267920
Settings: We printed this on a Replicator 2 using our minimal-support MakerWare custom profile from Day 110. This profile is based on the Standard PLA profile, with the following modifications:
- "roofThickness": 0.5,
- "floorThickness": 0.5,
- "sparseInfillPattern": "linear",
- "infillDensity": 0.2,
- "minSpurLength": 0.4,
- "doSupport": true,
- "doSupportUnderBridges": true,
- "supportDensity": 0.1,
- "supportExtraDistance": 0.8,
- "supportModelSpacing": 0.5,
Technical notes: To create the model for this object we used the same procedure we followed in Day 192, detailed below.
- Use Mathematica to create the polyhedron and export to STL:
- Use MeshLab to convert to OBJ format.
- Use TopMod to remove edges or vertices that don't belong in the wireframe, and then create the frame and remesh:
Remeshing/4-Conversion/Linear Vertex Insertion
Export as STL
- Use MakerWare to size and orient the model. Specifically, Mathematica creates models in inches, so when this model is imported into MakerWare it will be very small (for example, a 2-inch model would only be 2 millimeters). Since there are 24.5 millimeters in an inch, we need to rescale by a whopping 2450%. This makes a really huge model so I scaled by another 50% before printing. By experimenting with the orientation of the model you can sometimes reduce the print time and amount of supports; in this case I re-oriented so that one of the pentagonal faces was flush with the build platform.
UPDATE: Mike Lawler (@mikeandallie on Twitter) alerted me to an related and even more amazing polyhedron posted on Mr. Honner's blog on the same day as this post: a beautiful wooden model of a Dual Snub Hexpropello Dodecahedron. While you are clicking on links you should also check out Mike's excellent blog mikesmathpage where he explores lots of interesting math with his kids!