Remove once suitably shape-changed, and take off the rubber band. Put it in the bowl, replace the lid, and boil for a couple of minutes (watch it, don't time it!). Take a coffee cup, and put a rubber band around it near the top. This behavior can be manipulated by applying a constant force to some parts of the cup, making it collapse inwards instead. We're going to take advantage of the fact that in the first few minutes in the slow cooker, the cup both softens and expands. Otherwise, you'll just melt the cup and make a stinky mess of your cookware. It's also important to cook the cup bain marie style, i.e. Whether you're making tiny cups or making funky vases of your own design, get the cooker up to heat first (on high). I did these in the slow cooker, but you get a more perfect little cup in a pressure-cooker (see the second photo - it's also faster). It also gets somewhat distorted, because the plastic gets quite soft. The photo above shows how when you heat the coffee cup, it first expands, then shrinks smaller and smaller the longer you leave it. It's cute, but not much good for anything (espressos?). You can do this by putting the cup in a submersible ROV and sending it 1400 m underwater, or much more easily, by popping one in a pressure cooker for half an hour - you'll get a neat miniature coffee cup. Put a styrofoam cup under high pressure and/or heat and it will shrink dramatically as the gas is driven out.
PAPER CUP DESIGN SNOW FULL
Styrofoam is a brand name for expanded polystyrene (a hydrocarbon polymer blown full of gas).
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