Printer noise I can't figure out

[Kirk.AIA]

I'm a new owner of a MakerGear M2 that I set up about two weeks ago. Things are going pretty well. Obviously I've been trying numerous settings during this steep learning curve. Today however, the printer started making a noise that's difficult to describe. What I am hearing is something that sounds like a pencil being dragged over basket weave. I know that because I tried to duplicate the sound with things I have around the house. That's the closest thing I can come up with that sounds similar to the noise I hear. I printed two separate models; one with a perimeter of 2 shells and one with a perimeter of 3 shells. A couple of things about this noise; it only occurs when it's laying down the last layer of the perimeter, #2 on a 2 shell and #3 on a 3 shell perimeter and it only makes that noise while the nozzle is moving in the X-axis. I was hoping someone on the forum here could help me out with diagnosing this little glitch.

[jsc]

Can you take a video of this mystery noise and share it with us?

[Kirk.AIA]

I can do that tomorrow.

[Jules]

Are you using the new Rev. E model? (Z-stop is at the bottom, not the top?) Are you printing PLA?

[Kirk.AIA]

I have the V4 nozzle, not sure what Rev. E model is. PLA is my filament for now. Eventually I will expand my horizons.
Anyway, I re-leveled the bed and now it seems fine. Not sure if that was the culprit or not, but I'm good to go for now.

[willnewton]

Could be dragging over the previous layer as the print head quickly moves, that makes a washboard sound.

It could also be resonance due to the particular print speed you are using. If I am reading correctly, it happens on your outer shell perimeter. You might want to change your outline speed (usually about 80%) down maybe 5% to see if it gets you out of the resonant frequency.

[Kirk.AIA]

I think you are right about the resonant frequency. I was listening to it last night during a print of a circular piece and it did sound like something on the unit was vibrating at particular locations around the perimeter. I'll play around with the speeds.
Thanks

[Kirk.AIA]

How do I post a 25MB video so you experts can listen to it and tell me if this is how my M2 is supposed to sound?

[Jules]

No idea on the video- i think most people just upload to YouTube and post a link here.

[Kirk.AIA]

That's what I assumed.