X / Y Drift On RADDS
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I am using the DRV8825 drivers. What T value do your recommend for M569?
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AFAIR you need about 2 microseconds for those drivers.
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yeah the drv8825 spec sheet says at minimum 1.9 microseconds. I set it to 2.
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Well that did not do it either.
M122 does not show any step errors:
Recv: MaxReps: 4, StepErrors: 0, FreeDm: 46, MinFreeDm 40, MaxWait: 154696ms, Underruns: 661, 0Regarding option 2, does any of these settings seem excessive for a Cartesian printer?
M201 X500 Y500 Z15 E800 ; Accelerations (mm/s^2) M203 X15000 Y15000 Z4000 E3000 ; Maximum speeds (mm/min) M566 X300 Y300 Z200 E200 ; Max Jerk (mm/min) -
A max speed of 15000 (250mm/sec) might be excessive, especially on the Y axis if it is a moving bed. Try 6000. A max Z speed of 4000 may also be too high depending on your Z steps/mm. Accelerations and jerk look ok to me.
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Going back to the first post, if everything else prints fine, then it has to be the model itself and/or the way it was sliced. There is nothing alarming in the speeds accels or jerk settings. I presume your slicer lets you set the actual print speeds?
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Well now I am really confused. Last night I marked all the pulleys and steppers with pen so I could see if any were slipping and none of them have moved. I also lowered the acceleration and jerk to a quarter of what I listed above and tried printing the part. The normally 2 hour print took over 8 hours and still messed up exactly as it had before. I am using Simplify3d as a slicer. I have tried both version 3.1.1 as well as the new 4.0.0. The only other thing I can think to check is if my belts are slipping, but the drift is only like 0.2mm per layer. I am at a loss.
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Did you lower travel speed too? Also it might be worth increasing the driver step timing to 3us.
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No I did not, but with the size of the print and the acceleration I had set there is no way it got even close to that speed.
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Sounds like you ruled out everything but S3D.
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How much drift would 4 full steps be on your printer?
