Josh GrossmanAbigail Taylor ‘13. CS AAPT2014 3D printing Types: Extrusion Binding granular material Lamination Light polymerization computer file (STL)

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Presentation transcript:

Josh GrossmanAbigail Taylor ‘13

CS AAPT2014 3D printing Types: Extrusion Binding granular material Lamination Light polymerization computer file (STL) build up material 3D object a.k.a. additive manufacturing

CS AAPT2014 3D printing Initiated in 1980’s Research → industry → DIY Exponential price drop Recently, rapid progress in capability materials, resolution, speed, … Rapidly expanding market Used for prototyping and distributed manufacturing Compare: home/office publishing (2D printing) with resources of Internet

CS AAPT2014 Printer #1: MakerBot Replicator Extrusion: fused deposition modeling (FDM) In-house; inexpensive Thanks to Alan Jamieson, SMCM Comp Science

CS AAPT2014 Printer #2: Shapeways service Bound granular material: selective laser sintering (SLS) Other materials & methods available Upload file, make payment, receive objects in mail Better resolution than MakerBot Replicator Much higher marginal cost per item, but don’t have to buy printer Marketplace uploading and purchasing designs SMCM MakerBot printer broke during project

CS AAPT 2014

Spherical Harmonics Angular solutions to Laplace’s equation Specified by l, m l = 0, 1, 2, … and m = -l, …, l Associated Legendre polynomials Legendre polynomials

CS AAPT2014 Spherical Harmonics Often initially confusing to students Geometric properties not immediately evident

CS AAPT2014 Spherical Harmonics

CS AAPT2014 Process Equations Mathematica STL file Software converts for printing Print Finishing (optional) Finishing (optional) Additional processing (optional) Additional processing (optional) e.g. ReplicatorG for MakerBot Export["00441.STL", RegionPlot3D[315*Abs[SphericalHarmonicY[0,0,Arc Cos[z/(x^2+y^2+z^2)^(1/2)],ArcTan[y/x]]^2] 150]]

CS AAPT2014 MakerBot models Honeycomb for solid interiors Overhangs problematic → print ½’s or ¼’s, then glue Zero thickness at origin → Individual plastic strands apparent → sand and paint ~$1 each

CS AAPT2014 Shapeways models Add thickness $15-$45 each

CS AAPT2014 Uses Spherical harmonic manipulatives used in Quantum Mechanics class and Atomic Physics study group Illustrated geometric features Prompted student discussion

CS AAPT diagram from Hyperphysics What’s next? Models of other 3D mathematical abstractions PvT phase surfaces for Thermodynamics classes, … Real objects for experiments Gears, wheels, moment of inertia test objects, … What would you do? By user ngoodger on Thingiverse Fluid filters by user siderits on Thingiverse