A coaster based on a slice of a Level 3 Menger sponge. Switch filament colors partway through the print.
Featured on Day 23 of MakerHome: http://makerhome.blogspot.com/2013/09/day-23-menger-coasters.html
Hacktastic blog: mathgrrl.com/hacktastic
Shapeways geekhaus store: shapeways.com/shops/mathgrrl
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