Mesh Generation - No trigger on probe after full movement
On my new build, I'm getting a "No trigger on probe after full movement" during mesh bed calibration. The first assumption is that the probe isn't working at all, but it homes just fine. The sequence of events is as follows:
1. Home printer (g28)
2. Start mesh generation (BED_MESH_CALIBRATE PROFILE="default")
3. Printer moves to the bottom left probing point, bed moves to about where I would expect it to stop ~5mm from the sensor, then gives the error.
The print head does not crash, it seems like the probe triggers and then it gives up and throws the error.
Big video shows the homing working fine. The top right video is the bed mesh attempt: https://youtu.be/317IEv7uWno
I'm wondering if anyone has any good troubleshooting options and I would appreciate any advice.
28 Replies
Have you done your probe calibration https://www.klipper3d.org/Probe_Calibrate.html ? It looks like it is awfully far away from the bed when it starts
I did, I just ran it again and it got halfway through the mesh then errored out again. I followed the instructions to position the probe 1mm above the nozzle tip.
by default it is 5mm movement - and looking at your Z probe you look pretty close to it. Maybe try increasing the probe distance?
The bed looks a little bit askew, but I expect that the process would accomodate that? I've only used a BL touch.
Increase the default movement? Or adjust the probe position?
how far above the nozzle is the probe? ideally you want it like 0.2mm above
Put it 1mm above
that's too high above. A 4mm probe only has like 2mm distance that it triggers at
Okay, I'll adjust it down. I can't find a setting for maximum probe distance in https://www.klipper3d.org/Config_Reference.html#probe anyway.
obviously you will have to re-do prob calibration after moving it
https://www.klipper3d.org/Config_Reference.html#z_tilt
horizontal_move_z: 5was what I was thinking about
I see what may be affecting it. I manually level the bed, then during homing it goes out of alignment.
Ah, that's something I should read through. Thank you.
You could use STEPPER_BUZZ to verify that z is the front left, z1 is the back leadscrew, and z2 is the front right leadscrew
Ran it now just to confirm. There's all assigned correctly, it just seems to want to home to an acute angle after being leveled manually.
What kind of numbers are you getting from
PROBE_ACCURACY ?
Hopefully you don't have slop in EVA or your linear rails and having that affect things when trying to z-tiltNo, this is too much to just be slop. probe accuracy results: maximum -0.062500, minimum -0.080313, range 0.017812, average -0.069469, median -0.066406, standard deviation 0.006477
I'm going to look at the z tilt options to see what the defaults are. I have a bit of a hacky config, but I didn't change any of the kinematics.
I have a bit of a hacky configwhat do you mean?
I'm using 2208s on the CB1, with all the Ratos files dumped into a folder.
yeah, your Z is slowly increasing instead of decreasing
perhaps you have the direction of them backwards?
There all moving in the right direction, it just seems like every homing and calibration operation brings the machine futher out of alignment.
how are you telling they are moving in the right direction? The fact they are moving away suggests they are opposite what they should be
I hit + and the platform goes down. If one was reversed, I would expect it to skew, as that one would go up while the others went down. It also completes homing just fine the first time. If the Z was reversed, I would expect it to crash the plate into the nozzle, then descend while it looks for the probe that isn't there.
When you say you hit + the platform goes down - are you referring to the
^ or the Z-offset buttons?
Just the normal up/down.
I have only used the z offset during probe calibration.
well, definitely your problem is that it is increasing in distance during z-tilt instead of decreasing. If you are sure your Z's are working correctly I would start looking into your mechanics. Are your leadscrews aligned, are your linear rails aligned, is there friction in your pom nuts, etc.
Everything seems to move smoothly, X axis is a bit rattley. The way it decides to skew in a strange direction after homing makes me think that it is something in software.
I kind of doubt it is software - because if it was a lot more people would have problems with z-tilt.
The leadscrew was slipping under torque. This was causing the front left to desyncrhonize and affect the repeatability of movement. Solved. Thank you for your help.