Advice to fix BLtouch drift?
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Do you actually mean 0.03 or did you mean to say 0.003?
I had to set my BLTouch to 0.005 to get the probing to finish (up from 0.003) but then it worked fine. 0.03 (rather than 0.003) is pretty bad .... -
yeah, .003 - sorry, I was typing on my phone (i dunno how people do that all the time.. give me a keyboard!! lol)
i'll try cleaning the pin. I just switched to PEI build on my glass and stopped using glu-stick - maybe there is some residue on pin.
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@supernovae said in Advice to fix BLtouch drift?:
maybe there is some residue on pin.
I find wisps of filament start to gather on the pin sometimes.
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This is what i get now that I try and have it set to A5
G28 Z
Warning: Z probe readings not consistent -
@Phaedrux said in Advice to fix BLtouch drift?:
@supernovae perhaps time to clean the pin.
is there a way to safely remove & clean pin or just have it deployed and gently clean it deployed?
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First lets look at the realistic results that the printer is able to produce
Your z axis has a resolution of 250 steps per 1mm that equates to a resolution of .0025mm now also remember that this is in micro steps which is not really all that accurate chances are the best resolution that you could achieve would be .003mm. BL touch also has a best case repeatability of .01 and actually if you read their documentation it mentions .05 mm. If you are getting better than this it is a bonus. If you are getting resolution better than this think of it as a bonus. -
@supernovae said in Advice to fix BLtouch drift?:
@Phaedrux said in Advice to fix BLtouch drift?:
@supernovae perhaps time to clean the pin.
is there a way to safely remove & clean pin or just have it deployed and gently clean it deployed?
There is a set screw at the top of the probe. You remove that and the pin will come out the top. The set screw is also how the trigger distance for the electromagnet is set.
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@percar said in Advice to fix BLtouch drift?:
First lets look at the realistic results that the printer is able to produce
Your z axis has a resolution of 250 steps per 1mm that equates to a resolution of .0025mm now also remember that this is in micro steps which is not really all that accurate chances are the best resolution that you could achieve would be .003mm. BL touch also has a best case repeatability of .01 and actually if you read their documentation it mentions .05 mm. If you are getting better than this it is a bonus. If you are getting resolution better than this think of it as a bonus.I'd be OK getting a reading that was +/- within some margin of error range, but the fact my variance keeps drifting further and further suggests something else. I'd expect my G32 bed probe heights to report more random distributions within the margin of error rather than going from 0.032 to .240 probing the same spot
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The really odd thing is, if i turn off, and not change anything and power back on, the first read is the same - every time... working on cleaning the bltouch tip to make sure its not friction causing height change
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Found out my problem. I noticed one side of my printer was always sagging towards end of print, ran motor unlock and i could rotate left z and feel steps, but right z just spun - i guess my right z motor had failed.
Replaced my right z motor, and now bltouch is happy and i don't have to run g29 between each print... kind of surprised i got the quality i did with that motor having been bad or faulty for so long...
but, i'm back in business... no more crazy drift, nice level bed and great prints again. took the time to move to reprap3 firmware and enjoy it too!
