Karl & Cheng
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Great experiment!
i think you need to have visual feedback coincident with the finger (IMHO) — GL.
Also, consider a meter whose contents get consumed, so that each person gets a maximum allotment of “stuff”.

transparency + fingerpaint!

Very interesting! I wonder if you could use a material that wasn’t as foam-y. Maybe just paint or something, and people could take with them what they made. -Amanda

could you use this to ice a cake? get that frosting in a can
^I like that idea! Bring cupcakes, yay!

I agree that feedback for drawing is essential.

You should definitely make some kind of poster explaining exactly what your project is/does and how to interact with it…otherwise I’m afraid that people will look at it for a second, assume it’s too complicated to understand, and walk away…

This is looking really good. I think you should make some examples of output before the show and display a few of them to show the possibilities so you’re not depending on the people at the show to demonstrate the full range of what your machine can do.

Please — read & print GML!!
Also — consider vacuum-forming white plastic over the drawings.
CAKE!!

I think rather than trying to simulate clay sculpture, it would be more meaningful if this allows you to create 3D forms that a human wouldn’t make (either because they’re not physically capable or just because they wouldn’t think to make a form like that). Like Golan said, respect the medium! Take advantage of its properties, don’t try to fight it.

I am intrigued by the applications to baking and cupcake decorating.