It might be that the question was asked before… but what could cause these diagonal ripples in the print ? It wasn’t present before in my prints, and I am not sure what’s the cause. No changes to the extruder or motor currents…
Need more info about your printer. Also, print something else with an irregular shape (like a Benchy) to see if the lines are still diagonals in XYZ space or if they move around with the layer size.
Which infill pattern do you use?
U use drv8825?
It’s a homemade printer, very rigid and high quality parts, IKO linear rails, E3D V6 original, Duet controller but with TMC2100 for x and y. Like I said, the issue came suddenly, my prints were clean. This is hollow, two shells. The diagonal continues on both axes. I tried reducing/ increasing the extuder stepper current, no change. Also it doesn’t change if I increase the speed of the print or slow it down. I will make some more tests with round prints and check the results…
Watch this link:
At slow speeds you do that because you need to put a diode between the motor and the ramps.
The plate is called smoother:
http://www.3despana.com/motores/502-smoother-suavizado-estabilizado-de-motores-drv8825-a4988.html
This looks like processing problem. Could you publish you Gcode file?
Delta, cartesian or other?
@WizTeK_OpsS 8825 rippling doesn’t match the symptoms or the hardware, I wouldn’t worry about that here.
Can you print something else that doesn’t have the same amount of plastic on each layer? Diagonals in simple straight-wall prints like this can be caused by a wide variety of causes, like some of the extruder hob teeth being full of plastic. If you get the same diagonal lines with more complex print geometry that rules out most extruder issues.
Had this issue when I switched out my extruder motor. No idea what really causes the issue but I had to switch back to resolve it
Add another layer to the outer wall and try that. Agnus at Makers Muse brought this issue up before. The infill can cause this pattern in thin outer walls because every corner is going to have a bit extra material.
Do you use “auto-leveling”?
@Ron_Hunn This is with 0 infill… Hollow.
@Whosa_whatsis yes, I use it. but I used it before as well, so nothing changed there. What’s interesting is that my previous print had no diagonal ripples, at least not visible, but a much rougher surface. Now the surface is smoother, but with these visible ripples. It’s clearly from the extruder, but why ? Nothing changed there too… a standard direct drive, no gearing…
What changed is the tilt of your bed, which in turn changed the trasformation matrix, which changed the interference pattern between the physical and logical coordinate sets. I can see interference on both, but one is much more noticeable because the artifacts are futher apart (probably indicating that the platform was closer to “level” in that case).
@Griffin_Paquette For your the stepper motor, the shaft might be bent and it extrudes the feeder gear isn’t turning concentric.
For this maybe you knocked the Z lead screw I had something like this and in the end I switched out the threaded rods and it fixed it.
Note that my hypothesis is an easy one to test. Just change the tilt of your platform, run the “auto-leveling” again, and print another test. If the pattern changes, you know this is the cause.
I would have to go with debris in the pinch gear. That makes the most sense given the description. I had the same thing: It just started happening out of the blue, then it wen away out of the blue (my printer has no auto bed leveling). If it happens again, I’ll check my pinch roller/gear.
Could you try feeling the X and Y motors while it is printing and see if you feel a pulsing? If it is pulsing, you have one or two of your four stepper motor wires not connected (or not connected well enough). I experienced that with my Shapeoko2 CNC mill a few months ago.