Comment Re:Hype (Score 1) 251
A watertight cup is not particularly difficult, no. I've made a variety of them, as well as fully functional teapots and the like(albeit made of plastic, so certain heat issues exist, but hey). Slumping should not be an issue. Expansion might be. You can minimize this with the right setup(heated bed, controlling humidity, or just using a different plastic). Layers usually fuse fine once your setup is good.