Using 123D Catch, I captured this great 3-foot tall Celtic Cross made of plaster that I've had lying around for years. Surprisingly, much of the Celtic knot work can be seen.
I'm sure if you scale it up even more, the knots will be clearer.
Created by Jason Bakutis
I did lots of research on the origins and meanings of the Celtic cross, and much of it is either vague, anecdotal, or both. However, I did read this one article, written back in the day of 1996, that I found helpful.
By the way, it does print without support, but it might need it in larger scale prints.