Trying to pinpoint what it could be, I’ve cared for the rails, calibrated, retightened belts, recalibrated, checked the belts as much as I can, cleaned the idler pulleys because they had some buildup on them…
But wondered if anyone had thoughts on things to check before I start to tear it apart aimlessly to identify what’s not operating smoothly.
Video has normal operation, then you can hear the low hum come in, it’s just the top right section of prints, it’s only toolhead movement from back left to right front or right front to back left, doesn’t happen front left to right back or right back to front left.
Unless it’s a super stuck bearing or there’s a random piece of plastic that landed in the back right somehow, I’m at a loss…
For me, when i hear this noise it is dirty carbon rods. Thats my experience.
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Ya that was the first thing I looked at. It sounds like it’s coming from the back right area of the printer.
Another thing i do with these two problems is lossen the belt screws. Then move the hotend carriage from corner to corner all four at least 10 times each way. Snug up the screws and I’m usually good for another 4 or 5 weeks till another full maintenance cleanup.
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That and oiling the idlers in the back didn’t work. Still doing it with that direction and orientation. Layer 1 is ok as seen, then layer 2 has it.
Have you found the cause? Was the distance between the ripples equal to the one between the belt teeth?
I did actually, i looked at the box again and the filament print speed was 70-90 and i was printing at 200+. What you’re looking at is the tearing of the filament as its being laid down.
Reduced speed all is ok 
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This! I used Tinmorry PLA Black that was rated for 200mm/s and I printed it at 350mm/s. Lowering the print speed removed the rippling effect. Also printing with Bambulab PLA Matte Blue that’s rated for 300m/s max. removed the rippling.
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