Hi Trucker_Jo!
Yes, it's pretty cool, but this print was a pain. I started it and it ran for 5-8 hours four times before I got one successful print. The problems were lifting edges, support coming loose, support lifting and SD card error. :-)
I'm definitely going to add some dampening material inside. Initially, I tried to print something like that, but it didn't work that well, and I decided to do it the traditional way, and then completely forgot about it. Thanks for reminding me! :-)
Here are some images of my attempts at printing the inner dampening:
Stein :-)