Hello @VirtualPilot ,

My apologies for the delay, we've been testing and been able to narrow this down and reproduce. It looks like if the service is set to double wall and has dimensions set to 'inside' instead of 'outside' couplings are not inserting properly.

I am escalating this to our development team for some feedback, but most likely this is something they will have to resolve in an update or future release,. I will post here with any initial feedback we receive.