Washing is very easy. Just soap and water is enough to get the surface to be coffee free. That sounds like a physics question! In general whenever the center of this object is over the base it will topple. The shape is overall close to a cube (55mm versus 60mm) so it is stable. I would need to do tests to verify this with the weight of the cup, but I would keep the heigh t to under double the width. So no more than 120mm. There are tons of ways to safeguard against this like using a wider base, adding felt to the bottom so it slides easier than it can tip, but again I will need to look into this more to give you a definitive answer.

Nice futuristic look. How easy is that model to wash and do you know how high that can be made until it needs wider base.

Well it's great, as is the story! You're in this week's Friday Finds :) http://www.shapeways.com/blog/archives/1571-Friday-Finds-3D-Printed-Designs-from-the-Shapeways-Community.html

It's my own design. I did a much stranger looking version of this and I tamed it down a bit.