woeful relic
Hey everyone,
I'm experiencing an issue where my BLTouch keeps returning different probe values each time I run the screw tilt calculate command, even though I haven't made any physical adjustments between runs. I have the Ender 3 with BL Touch. I have a glass and PEI bed (pei sheet on glass, not metal)
true ospreyBOT
Ahoi @woeful relic!
It looks like you did not provide all the necessary information we need to help you.
Please upload your logfiles and a detailed description of your problem.
For further information see: https://docs.mainsail.xyz/faq/getting-help/discord#provide-information
Note: We only accept .log and .txt files as log files.
This is an automated message
woeful relic
^ klippy.log
split orchid
what happens when you run PROBE_ACCURACY?
https://www.klipper3d.org/G-Codes.html#probe_accuracy
woeful relic
oh that might be the issue:
probe accuracy results: maximum -0.930000, minimum -0.977500, range 0.047500, average -0.961500, median -0.962500, standard deviation 0.012155
woeful relic
what happens when you run `PROBE_ACCURACY`?
https://www.klipper3d.org/G-Codes.ht...
how can i fix it tho
split orchid
no idea... never used a bltouch. Bltouches can be kinda error prone, at least what i've heard so far.
well a deviation from 0.012 mm could be worse. the range on that bedmesh looked far greater
woeful relic
yeah, but what can I do here? for example, the first run of screw tilts adjust suggests that its near perfect
woeful relic
since one full turn is abt 0.8 mm from what i can remember, 0.0475 mm ÷ 0.8 mm/rev ≈ 0.0594 turns which is far from the deviation screwtilt gives me
split orchid
okay... lets try this the other way round... do you have issues with your first layer?
split orchid
this looks pretty much level to me
woeful relic
not sure if this is important but the home point it takes for center of the bed isnt the center of the bed (the nozzles there, not the bl touch)
yes sir ima try again hopefully it works 🙏
bruh wth
split orchid
pls post a klippy log
woeful relic
pls post a klippy log
do u think that my bed could also jus be really warped
split orchid
Are warped bed is usually more like a taco or falls in one corner at least something less random.
The other thing those extremes your bed mesh shows are consistent at their location.
It’s always the front reight corner which falls extremely.
So your bed might be part of the issue.
What kind of print surface you’re using?
We are talking here about a deviation from about a half millimeter that’s not something you can barley see
At the end you’re the one sitting in front of your printer and seeing the whole. I just see the limited picture you’re sharing here
woeful relic
Are warped bed is usually more like a taco or falls in one corner at least somet...
sorry I just saw this
Im using a glass bed with a pei sheet like this
woeful relic
after a remesh it looks the same. This matches wat i see irl; the middle first layer always has a bald spot
split orchid
The surface of the bed don’t look so clean. Try to turn the glass bed around and to a mesh again. Maybe your pei is the culprit
woeful relic
The surface of the bed don’t look so clean. Try to turn the glass bed around and...
ok thanks
i should note this:
ofc the paperclip foxes it somehat but it still exists
😭
woeful relic
but when i spin it ccw it gets the value higher? It goes lower if i go cw
split orchid
I am a bit handicapped in my writing right now. But when using the clamps something gives in and this is not necessarily the flat one
Did you try to level it oldschool with a piece of paper to rule out your bltouch?
woeful relic
Ill try that or use it to check the leveling accuracy
woeful relic
should I try from other points or at the corners? it works at the corners but similar issue
woeful relic
doesnt seem too bad besides the last point
woeful relic
idk why byt the bed is always going really down then up at the same spot
split orchid
Then it most likely goes really down there. Even when the bltouch readings vary this is pretty consistent
