The second 3D print ever of a part from the inside of the mandelbulb (as far as I know…) the first one was This one. (but I doubt that one will be printed again), very small details...
Here in raw "Strong White and flexible" The inside of the brace shows the outside of the mandelbulb spine. On my 3D printed mandelbulb bracelet you can actually see these pointy spines on the inside, this is a zoom of one of them.
M3D > Fiji > Meshlab > Netfabb > Shapeways > your wrist. Use it as a brace, or just as a beautiful mathematic sculpture...