The reason it crumbles is because it's all full of bones. The largest Femur and the first Illium came out of this block and the ones next to it. I wanted to tackle something productive and new.
The first two bones are already not what I expected. The first on I expected to be a limb bone, and the second a small sector of a centrum. Big surprises on both of them!
Here is the one I first thought was a section of Centrum. However, a little excavation shows it is not a centrum, but is something else.
Maybe the back end of the skull, including a brain case and the arch going over to the quadrate.
More excavation reveals a bridge (concave) bone between these two sides. WTF?
A partial neural arch and centrum appear, tucked under the edge of the bone. Sometimes I feel like the bus driver who said "It's much easier to keep to the schedule when you don't stop to pick up passengers" In my case it's much easier to excavate bones when you don't have to work around other bones that you find!
In addition to this preparation, I've been printing out pseudo tail bones. I'm now up to 40 bones printed out of a total of 65. These last bones are getting small, so I'm going to try changing over to a smaller extruder nozzle (0.3mm instead of 0.5mm) and printing in thinner layers (0.1mm instead of 0,2mm). Hopefully this will give us the needed detail. These will total up to be a tail over 5 feet long!
Sincerely, Greg Carr