Tevo LM recent conversion and z step issues
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@the_gibson what deviation are you getting from G32 when it converges (i.e. running G32 repeatedly untill the is very little difference between runs)?
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@t3p3tony High deviance no matter how many times I run it... I think I found why, and now I'm working on figuring it out. When the furthestmost forward Probe point is attempted, the sled for the X Axis is hitting the end of it's bottom travel, and bumping twice before it triggers the probe. That reading has to be throwing the whole thing off.
Going to work on adjusting the height of the bottom pulley, but is there a way to adjust the probing pattern? This is odd, because no mechanical changes were made, and the old smoothie board worked fine in this way.
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@the_gibson said in Tevo LM recent conversion and z step issues:
but is there a way to adjust the probing pattern?
yes the probe points should be specified in your bed.g
G30 P0 X0 Y132.28 H0 Z-99999 G30 P1 X121 Y69.86 H0 Z-99999 G30 P2 X129.9 Y-75 H0 Z-99999 G30 P3 X0 Y-150 H0 Z-99999 G30 P4 X-129.9 Y-75 H0 Z-99999 G30 P5 X-121 Y69.86 H0 Z-99999 G30 P6 X0 Y59.15 H0 Z-99999 G30 P7 X56.09 Y32.38 H0 Z-99999 G30 P8 X64.95 Y-37.5 H0 Z-99999 G30 P9 X0 Y-75 H0 Z-99999 G30 P10 X-64.95 Y-37.5 H0 Z-99999 G30 P11 X-56.09 Y32.38 H0 Z-99999 G30 P12 X0 Y0 H0 Z-99999 S6 -
Try reducing the Y-150 on line 11 of your BED.G (line 4 in Tony's post) Post that will move the front probe point towards the centre try starting from -140.
ie make line 11 to be "G30 P3 X0 Y-140 H0 Z-99999" as you have it the front probe point is effectively 2.5 mm from the edge of your bed.
HTH
Doug
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@dougal1957 said in Tevo LM recent conversion and z step issues:
G30 P3 X0 Y-140 H0 Z-99999
Testing now!
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How about that...
G32
Calibrated 6 factors using 13 points, deviation before 1.177 after 0.026 -
@the_gibson looking better has that solved the problem of the carriage fouling? also try running the G32 a few time see if it all settles in to lower figures (or the after deviation converges down so that each subsequent run doesn't get much different)
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@dougal1957 Already all over that... and yes, carriage is good now.
I'll be posting back with results shortly.
definitely getting better.
G32 Calibrated 6 factors using 13 points, deviation before 0.085 after 0.031 -
@the_gibson ok, looking good now.
G32 Calibrated 6 factors using 13 points, deviation before 0.036 after 0.035Going to try another print.
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@the_gibson It is better, but definitely still dragging the print. first layer goes down great.
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@the_gibson ok so delta calibration is looking good now, and you say the first layer is going down well, what do you mean by "but definitely still dragging the print"
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@t3p3tony like the Z steps aren't moving appropriately. As soon as the second layer starts, you can hear the hotend dragging across the print, eventually either breaking the extruded material free of the bed, or creating a very deformed print. This still feels like either an extrusion issue, or a z steps being off issue.
but first problem is definitely fixed.
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@the_gibson said in Tevo LM recent conversion and z step issues:
@t3p3tony like the Z steps aren't moving appropriately. As soon as the second layer starts, you can hear the hotend dragging across the print, eventually either breaking the extruded material free of the bed, or creating a very deformed print. This still feels like either an extrusion issue, or a z steps being off issue.
but first problem is definitely fixed.
What size pulleys do you have 16 or 20 tooth or some other size?
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@dougal1957 Stock 20 tooth pulleys.
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@the_gibson said in Tevo LM recent conversion and z step issues:
@dougal1957 Stock 20 tooth pulleys.
Have you double checked them as your symptoms suggest that yours are slightly different to that.
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@dougal1957 I have not. Assumed they were what was listed on the printer specs. You think they are 16's?
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@the_gibson said in Tevo LM recent conversion and z step issues:
@dougal1957 I have not. Assumed they were what was listed on the printer specs. You think they are 16's?
that is what I would think maybe what you could do is mark one tooth with a sharp and then count them.
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@the_gibson I think that your steps/mm are right for x/y/z. If they were wrong you'd get a calibrated height that was well off of 530 because the calibration also calibrates how high it can go. Also, mine was running back in its stock days with the same value.
Is your first layer actually a little too close? You could print a cube and see if you have "elephant foot" at the bottom indicating it is too close.
If not, are you extruder steps/mm correct and have you calibrated the flow rate? Dragging could also be over extrusion.
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@dougal1957 Definitely 20's.
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@crpalmer I am leaning toward overextrusion now as well.
