LayBrick is a new experimental filament from Kai Parthy, developer of Laywoo-D3 wood-based filament. This one consists of a thermoplastic with fine-milled chalk as a filler, and so it prints with a decidedly ceramic look and feel, and an off-white putty color. I've tested it for a few days now on my Ultimaker, and have been very impressed with the initial results. Indeed, I'd say it's perhaps my favorite printing material at this point. It's not cheap, and it's something of a niche product, but it opens up some new possibilities for 3D printing. One of the unique features about this filament is that provides a textured finish that almost completely hides the layering in most circumstances. The cup shown here (click on it to see it larger) is about 6cm high, and was printed with 0.15mm layers. It has a rough, unglazed-ceramic texture, and almost no visible layering. Interestingly, however, the material can easily be sanded to a beautifully smooth finish, and can be softened in some solvents (but see below for some caveats).