Hey, I am receiving the same '3dtds' error while running simulation on a 3D SRM model in ANSYS Maxwell. Do you know how to fix the problem, i tried all the things you said above but it is still not working. When i am not using the external circuit in my simulations, it works fine without any errors but when i import an external circuit for the same model, this error shows up. I have around 16Gb RAM on my computer and i'm no sure if it is because of space or something else. Please help!!