My espresso machine has a feature where it will suck up milk through a tube to make foam. I figured to print a conical vessel to hold the milk and ensure that t

My espresso machine has a feature where it will suck up milk through a tube to make foam. I figured to print a conical vessel to hold the milk and ensure that the tube would always be submerged to the bottom. Took not too long to design using openscad and print a few (the first was too small, the second failed to print halfway through. When the material doesn't adhere it ends up glob bing onto the end of the print head and makes a huge mess.) Ok, so finally, I have my vessel and I pour in some milk. And then I watch as the milk mysteriously disappears. Turns out that the print is not quite watertight and the milk oozed between the inner wall and outer wall of the cup, where there is a honeycomb-like space. (Most objects are not quite solid, in order to save material.) After washing it out, I figured I'd use it for pencils or something. But you know, you can never quite get the rancid milk out of a porous plastic object. At this point, I won't be quitting my day job to be a 3d designer, but I will say that I've had $2000 worth of fun and learning, so that was worth it. The printers at this point are pretty much able to print things that quality of something you would get for free in your breakfast cereal.