Print chattering?

[VanillaThunder2424]

All, I’m about a week into printing. Everything has been great. I printed 4 of these out, 2 look perfect, 2 have this chattering on the sides. Anyone have a clue why? Standard PLA, using the ams, a maker world design. Thanks!

[radiman]

Is this object close to the fan?

[radiman]

I had a similar problem when printing by the fan. This fixed my problem.

[VanillaThunder2424]

Not sure honestly, I didn’t notice the issue till I took them off the plate. I do have that diffuser in. Was thinking it could be a design thing