The Utah teapot was one of the early 3D reference objects. It’s canonically a Melitta but hasn’t been part of their range in a long time, so I’d been watching Ebay in the hope of one turning up. Until last week, when I discovered that a company called Friesland had apparently bought a chunk of Melitta’s range some years ago and sell the original teapot. I’ve just ordered one, and am utterly unreasonably excited about this.
 They have them in 0.35, 0.85 and 1.4 litre sizes. I believe (based on the measurements here) that the 1.4 litre one matches the Utah teapot.