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We present the first 3D prints of output from a supercomputer simulation of acomplex astrophysical system, the colliding stellar winds in the massive (>120M_Sun), highly eccentric (e ~ 0.9) binary star system Eta Carinae. Wedemonstrate the methodology used to incorporate 3D interactive figures into aPDF journal publication and the benefits of using 3D visualization and 3Dprinting as tools to analyze data from multidimensional numerical simulations.Using a consumer-grade 3D printer (MakerBot Replicator 2X), we successfullyprinted 3D smoothed particle hydrodynamics (SPH) simulations of Eta Carinae'sinner (r ~ 110 au) wind-wind collision interface at multiple orbital phases.The 3D prints and visualizations reveal important, previously unknown'finger-like' structures at orbital phases shortly after periastron (phi ~1.045) that protrude radially outward from the spiral wind-wind collisionregion. We speculate that these fingers are related to instabilities (e.g.thin-shell, Rayleigh-Taylor) that arise at the interface between theradiatively-cooled layer of dense post-shock primary-star wind and the fast(3000 km/s), adiabatic post-shock companion-star wind. The success of our workand easy identification of previously unrecognized physical features highlightthe important role 3D printing and interactive graphics can play in thevisualization and understanding of complex 3D time-dependent numericalsimulations of astrophysical phenomena.

3D Printing Meets Computational Astrophysics: Deciphering the Structure of Eta Carinae's Inner Colliding Winds