Ok. You really know what is going on. On the left - my attempts to make it better, on the right - your profile. It's some budget TPU, not the HS one, but still, spot the difference :-) Thanks!

It's a bit fragile. Printed in PETG, but unfortunately the hinge broke after few days.

Amazing! I used small rubbers to hold the bones while the glue dried. Bones printed with ivory PLA and the core with white TPU 90A