I've been trying to resolve this extrusion issue since receiving my Hemera kit. Individual layers are appearing with a very intermittent wave pattern. I'm using a Ender3V2 which has the 4.2.2 board. I've adjusted VRef for all stepper drivers. I have a dual-Z screw kit from E3D, BLTouch 3.1, Marlin 2.0 custom build with changes as specified by Hemera setup and mesh bed-leveling enabled. The pictures show 4 sides of a hollow 1mm thick, 20mm x 20mm wall calibration cube. This one was printed with Cura settings: Nozzle: 0.4mm Extrusion Width: 0.45 Wall Line Count: 2 Print Temp: 195 Bed Temp: 60 Flow: 100% Wall Print Speed: 25 mm/s Fan Speed: 75% (5015 radial with fang-style duct) Filament: BASF Ultrafuse PLA White Adjustments that I've made to test. None of which have had a significant effect on the waviness: Extrusion widths: 0.4 - 0.67 Wall Line Count: 1-2 Print Temp: 195, 200, 210 Fan Speed: 0, 75, 100 Wall Print Speed: 25, 30, 40 Filaments: IID Max PLA+ Black, BASF Ultafuse PLA White, Filaments.ca Standard PLA 4043D Leaf Green, eSun PLA+ WHITE I've cleaned my rails and wheels, adjusted Z height, leveled X-gantry, all belts are tightened to low twang note, physically moving each axis slowly is smooth. There is no filament on extrusion gears or hobs. The extruder grip tension is unchanged since I received it since it seemed tight already. I've calibrated ESteps to 391.20 from the suggested 409. I've measured each of the filament diameters and they're all within 1.75 +-0.05 using mitsu calipers and micrometer. I've checked these tools for accuracy using metal calibration shims from mitsu as well. They're good to 0.01 and 0.002 respectively. Some filaments are on the low side and others are a bit higher, but nothing completely out of range. I've kept the filament diameter and density settings in Cura the same for all prints. The waviness is not the same on each face. It's not the same across prints on the same face. The wave lasts less than the width of any individual face, and wraps around corners. This is *not* the moiré pattern some threads discuss. I can actually see the moiré pattern behind these waves, but it is much less noticeable. I don't believe this has anything to do with issues on any individual axis. Z-axis binding would show banding on the similar layer heights. An X/Y-axis wobble would also show in the similar place on each corresponding traveling face. I'm printing on a borosilicate glass bed. It's surface is flat to within 0.01mm. See mesh visualization. This is using 3 tests per location, 7x7 grid. The only thing I can conclude is that there's an issue with extrusion, but I'm at a loss as to what would fix it. I know that my ender can do better than this. The stock extruder with a bowden tube produced some very nice benchies. Each with layer lines that were extruded perfectly consistent. I went to a Hemera to print flexibles, but if I can't do PLA as well I think I might have to try a different extruder. Has anyone else seen this? How do I make those waves go away?