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Ice That 3D Cake

The folks at CNCDudez have been experimenting with cakes. Frosting cakes, actually. With a 3D printer. Spokesman Sean says: 
We have seen videos showing chocolate being extruded out of a syringe and also cake dough being extruded to make cookies. But we wanted to see if we could Ice a cakes, buns etc etc. So - we attached an Icing/Piping attachment to a custom bracket we made for our 3D Printer. 
The results are, well, messy, but evidently tasty. They had issues with "dry icing" and ended up inventing a "punch and extrude" approach that required rewriting the geode that controls machine movements. 
Be sure to watch their videos to see exactly how messy this can be. 

Fashion and Jewelry 3D Printing Workshop

GrabCAD's Tool Challenge