Kramba riged body

Hello there,
I have been working with Karamba for a few weeks now, simulating round timber frames. But every once in a while I still run into ridged bodie Problems. However this time I can’t find the ridged body, I have looked at it for quite some time now. Can someonelse please have a look at it? An outside Opinion would really help.
Kramba_Ridged Body round (83.2 KB)

your frame is kinematic when you release the Ry as shown. The eigenmodes component shows this too

Thank you :smiley: