Two rounds, the first one was technical and with a staff engineer, mostly asked about my research experience the second round was with the hiring manager questions asked: 1 Introduce yourself 2. why int in this position 3. most fav and least fav course 4. where do you see yourself in 5 years 5. what do you expect from this internship 6. what kind of you work you want to and what is the ideal environment for you

30 minutes of in depth discussion about previous work experience. Asked for specific details about projects. Manufacturing processes decisions, 3D print settings, material properties, design thought process. Basically you have to have some relevant experience and you have to know what and why you did what did.