On my 1 week old A1, I encounter strange noises during printing and this bothers me. During the printing process, there are strange noises as if caused by vibration. It seems to occur mostly when doing circular operations, but it also happens in normal operations. I don’t think the nozzle is rubbing the part.
I had a similar noise on my A1 after one week as well. After opening the plate covering the Y-axis unter the heatbed it turned out that the adhesive foil with the green rings marking the spots where you need to put the screws in when mounting the Y-axis and heatbed to the frame had started to come off and was rubbing against the mechanics and Y-belt. I just cut off the loose part and all has been quiet since then. Maybe you face the same issue.