On its first outing, my 3160 toppled over in the trunk. Fortunately, only a rub mark on the outer case. From then on, I put it behind the seat and moved it to the trunk if I was leaving it in the car during the day while at work. Then back to behind the seat for the drive to my class.
The other day, I put a very very small "ding" in my new and expensive embroidery machine. Sulked for a few hours and then got over it. At some point, and if we love and use our machines, they will get marks or whatever on them.
I'm glad to hear you love your 3160. I love mine!