Z height incorrect at print time
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If regular movement is accurate but when printing the parts came out short, then my guess is that it's skipping steps.
It could be that you are trying to move Z too fast or the motor needs more amps. -
BTW, have you tried with a different slicer?
Is that a 4 starts 2mm pitch TR8*8 leadscrew? -
hey I'm experiencing the same issue and have been scratching my head pretty hard… regular non printing move Z measured accurately but when printing upon getting to layer 3rd or so it appear to stay at 2nd layer and thus squashing everything.... I'm on 1.19.2 as well
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thirty6 what Z motor are you using? you set the current for 1600mA? seems high for regular nema 17?
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I was recently alerted to a bug whereby a M109 command can cause unwanted movement, and it's occurred to me that this could be the explanation for reports of incorrect Z height. To see if that's the reason, edit your GCode file, replacing each M109 command in it by a similar M104 command followed by a M116 command (no parameters are needed on the M116 command).
This bug doesn't affect everyone, and it is believed fixed in firmware 1.20RC1.
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dc42 checked my gcode and there's no M109 there.
sorry thirty6 didn't mean to hijack your thread but seems appropriate to add my issue here
I have T0 and T1. T0 seems perfectly fine. T0 is the one experiencing this incorrect Z height while printing issue. perhaps something in my Tfree? but there's no M109 there as well
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…I have T0 and T1. T0 seems perfectly fine. T0 is the one experiencing this incorrect Z height while printing issue.
Did you mean that T1 is fine, ot that T1 has the problems?
Do you have any tool Z offsets set in your G10 commands?
Are the two nozzles at exactly the same height, or not?
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I don't have Z offset on my G10
both T1 and T0 were used starting from 1st layer. 1st and 2nd layer looks perfectly aligned so both nozzles confirmed at same height. and then 3rd layer starting with T1 it start squashing everything that's when I stop the print.
I used S3D to slice.
I will try Cura to see if it makes any difference
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still in S3D. now I'm super confused. I tried disabling Z hop. problem still there.
I tried printing a simple cube calibration (grey T0) and (white T1) and they were completed fine. so I'm not sure what triggered the issue of Z squashing down…
(there were ooze shield but I took it off to take the photo)
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single head printing appear to be not affected by the Z squashing issue. I can print gcode with T0 only and gcode with T1 only both came out perfect.
it probably just worth upgrading to the latest RC version and see if I can repeat this problem with dual printing..
