Is my bed warped?
Hi everyone. I'm at my wits end here. I have been back and forth with support several times. I ordered my printer about 3 weeks ago, and assembled and calibrated it exactly the way that the manual tells me to. I've not been able to get a single solid print beyond a calibration square. Right now I've had to adjust the left, right, front, and rear prints but that only causes the center to mess up. My full bed test looks like the attached image.
Re: Is my bed warped?
Lay a ruler against the bed, first in X then in Y, and see if the bed is flat. Please post photos.
A non-flat bed should be taken care of by the XYZ calc. I presume you have done an XYZ Calc?
Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss. If you solve your problem, please post the solution…
Re: Is my bed warped?
Do you have a frame built correctly? If you put the XY part of the frame into the Z part of the frame (vertical Prusa frame) wrong, the calibration or Z adjust will be very hard. You have to place the XY frame into the Z frame on the very bottom and fasten the nuts hard. It can easily move up on one side before you fasten it.
It happend to me during upgrade to MK2s. Even if I did nothing with the frame itself, I rotated the printer several times on side and back and one side of XY frame moved probably in the Z frame. During the Z calibration, the nozle was not possible to calibrate. It crashes the bed on one side. Maybe you have the same, but just a little bit.
Sure first try to lay the ruler on the bed, as adviced before me.
Milos
Re: Is my bed warped?
And one more thing to check. Take a look at the bottom of the bed if all the screws go directly to the nuts on the bed and there is no space in between. Sometimes the holes in the bed holder part are so tight, that they work like a nut. And then the nuts on the bed are not fasten right to the holder part. Especially the ones in the middle.
Milos
Re: Is my bed warped?
No everything is assembled as required in the instructions. I tried the ruler thing and it looks flat, or at least as best I can tell. I've still not had a good print and today I'm getting the "Bed Leveling Failed. Sensor triggered too high" error despite zero changes whatsoever to anything.
I'm beginning to think that Prusa sent me a lemon.
Re: Is my bed warped?
None of the beds shipped are completely flat, especially when heated.
The curvature between beds will vary quite a bit.
And to compound the matter further, the probe response will also vary depending on the probe position and the probing point.
The bed level adjustment is provided to compensate for this for the front, rear, left and right of the bed, but in some cases this simply does not work.
And this is the reason I came up with the "hyperfine bed levelling" which has since been significantly improved by other members of this forum.
I would suggest that you have a look for that thread and maybe install Waldemar's version of the firmware (links to which you will find in that thread).
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Is my bed warped?
I understand that, but that doesn't explain the "Bed Leveling Failed. Sensor triggered too high" happening every day. My only fix is to recalibrate every single time I try to print
Re: Is my bed warped?
I'm by no means an expers so someone correct me if i'm wrong, but bed leveling failing sounds like your pinda probe is not mounted at the right height. but be ready to turn the machine off if the nozzle hits the bed when messing with this, and recalibrate Z and live adjust Z accordingly.
I'll quote aaron's post from the sticky trouble shooting thread
"NOTE: If your Live Adjust Z value is >1mm something is wrong. It should be approx the distance from the PINDA probe to the nozzle. Anything between 0.4mm and 1.0 should be fine. (Less than 0.4 means the PINDA probe might catch on some print that curles up a bit, greater than 1.0 means either you did something wrong, or are just barely in the PINDA’s detection range.)
NOTE: The above may not be correct. The Live-Z value might be different from the PINDA to nozzle spacing if the PINDA is particularly sensitive or particularly insensitive. If the value is out of bound, proceed, but with caution. Most users on the forum report numbers “near” the distance from PINDA to Nozzle, but some seem to have more sensitive PINDA sensors which can me moved significantly higher than 1mm, and the Live-Z value is drastically different."
Re: Is my bed warped?
Well got another pinda and bed. Prints look MUCH better but the problem now is that it keeps erroring after a few prints and it looks for the levels across the bed. I keep getting the same leveling error but that's for another thread.