Cerra Canna ceramic knives are very different from an Exacto, in that besides being made of ceramic, they are incredibly hard to cut yourself with! Don't get me wrong, I love my Exacto knives but they do not harbor similar feelings for me or my thumbs. Owch. I love my ceramic knife set. The "blade" is really about as thick as a coin, and it's the cornery edge of that thick blade that is the actual scraping and carving edge. They come in a few shapes, and I'd recommend getting at least the one straight flat one.
I know it's $31.00 for a simple hand tool, but honestly, I'd hand over my Dremel before I gave up this little thingy right here.
When you carve with a ceramic knife, it's a lot like peeling a vegetable. You kind of scrape with it and smooth the little bevels each stroke causes, and it's a good way to remove mass without making too much flying dusty mess. You still have to wear a HEPA-rated mask and clean up your dust carefully, but it's way easier to clean up when it's not a fine powder all over everything in the room.
You don't have to be a serious drastic Modder to benefit from one of these, either. This scraping method of carving is very good for smoothing seams you intend to sand. (Shown Above) It can help you get the rough part of the seam off before you start smoothing it out and finishing it with high grit sandpaper.
