Weird Ripples on My Maestro rrf3 Conversion
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Thx for the reference. I found this also where he's having exactly the same problem. some motor talk in it and I don't really know what to make of it.
https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-how-do-i-print-this-printing-help/fdm-printing-on-a-prusa-just-gets-interestinger-and-interestinger/ -
@4lathe said in Weird Ripples on My Maestro rrf3 Conversion:
So my wild assed guess is about 1 pulse per whole step of the motor. Not sure what that means though???
I'd say it means that you have more filament extruded at the full step position. The only reason why that would be that I can think of is that grouping of positions around the full step position. Now what is causing this grouping I have no clue, is it bad motor, bad psu, bad driver - no idea ...
btw, when you drive motors with more current the microstepping positions seem to get more evenly spread out .. you can try increasing the current for the motors to see if the pattern will get less prominent
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Any point in trying to change some parameters on drivers?
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@4lathe said in Weird Ripples on My Maestro rrf3 Conversion:
Any point in trying to change some parameters on drivers?
You could try forcing spreadcycle. At the low speeds of the first layer you might be in stealthchop mode?
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I printed a 2 perimeter open cube. Had vfa. M569 reported stealthchop. Set x stepper to spreadcycle. Reran. Same results. Also tried the same upping x current. Same. The only thing that made it almost entirely vanish was printing perimeters at 60mm/s. I guess this has been reported in other vfa threads. What I don't understand is why was I not getting this with klipper or on the stock board?
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It's unlikely but not impossible that the stepper driver that is driving the extruder motor is faulty. You can check this by switching to a different motor output. If the E1 output is free, then with power off move the extruder motor connector to that one. In config.g add M586 X0 Y1 Z2 E4 somewhere near the beginning (before the M906 and M350 commands). That will redirect extruder 0 to the E1 motor output.
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Don't want to bear a dead horse but. I bought a ldo .9 stepper and tested it on a known good printer. No problem. I took the bondtech off that machine as a known good extruder. I put polycarbonate wheels on the ender 3 and adjusted everything including recalibrating extrusion and using a different filament. Then I started printing vase mode cubes that are 60mm tall and 50mm on a side looking for patterns. I made a script to increase speed from 20mm/s to 70mm/s every 10 vertical mm to see how speed affected it.
It is all basically the same after all this. I also tried changing steppers from stealthchop to spreadcycle to random and constant. I also tried stealthchop but upped the cutoff speed at which it went to spreadcycle, thus forcing it to stay in stealthchop. None of this made any significant difference. This machine did not do this with the stock board but upgraded extruder in it. Im at a complete loss at this point as to what to try.
Any thought much appreciated! -
Sorry forgot the photos.
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@4lathe said in Weird Ripples on My Maestro rrf3 Conversion:
Any thought much appreciated!
Did you try a different driver for the extruder as DC42 described above?
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Yes I trued the other driver. also changed my config settings for speed etc to the ones you provided to someone in a dec. thread on sort of the same topic. He ended with abs printing ok and the thread just stopped.
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Out of curiosity are you seeing anything unusual in an M122 report?
You're on RRF3, did this also occur on 2.05?
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Struggling with VFA on a Duet wifi 1.04, titan aero and .9 steppers on X/Y myself running rrf 3
also trying to figure out my horizontal variation - may be temp related so i'm looking at my heatbed (no fan was on for this print) but you can clearly see all my vfa - it just looks weird because of the shape
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@Phaedrux I don't know as when I installed the Maestro, I went to rrf3.
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@4lathe I'd be curious to see if there is any difference if you went down to 2.03.
It shouldn't be too difficult. Make a backup of your config. Grab a config set from the configurator, and upload the zip file. If there's no difference, easy enough to swap back.
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@Phaedrux Ill try it.
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Just throwing this out there... Is it possible that the pulse pattern matches up to the heat cycle on the hotend? Is this a E3d V6 hotend?
Maybe the brief micro changes in the hotend temp while extruding causes this result you are seeing?
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Interesting thought. The heat parameters were new for the maestro from those when I was running marlin or klipper on this machine. Way to test??
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@4lathe Have you done a PID tuning?
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No I just copied parameters from my e3dv6 on my delta. Ill do that first but is there any way to test the pulsing issue?
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@4lathe Just by watching the temp reported. Is it stable? A small variation is to be expected. With a PT100 sensor and a sillicone block sock my hotend temp varies about +-0.5c. How much does yours vary?
Still, running a PID tune is quick and will eliminate it as a variable altogether.
Will be interesting to see the difference in results.
