Crashing on 'improving bed calibration point 2/4'
I got my prusa i3 mk3 a week ago. The calibration went just fine then and I've printed several things just fine. Since then I've started using Octoprint (just fyi). One of the prints I did broke free from the bed and the small parts got fused to the print head until I cleaned it off. I think my print head is pretty clean now.
However, after this failed print I was getting more and more prints fail. Admittedly, they were small intricate parts. I decided to re-calibrate during the calibration the head keeps crashing hard into the bed.
Here's a video of the head crashing into the bed and torquing the z axis on the 'improving bed calibration point 2 of 4.
I've gone back to the instructions and re-done the PINDA height check so that should be fine. And the first part of the xyz calibration seems to work fine. It's just when it moves onto the improving bed calibration that it fails spectacularly.
Please help!
Firmware: 3.1.3-245
y distance from min: left: 11.44, right: 11.43
measured skew: 0.04
Re: Crashing on 'improving bed calibration point 2/4'
i could be wrong, but i think you need to do the calibration with the steel plate in place. check the manual to be sure.
- 1st "printer" TIKO 3D
- 2nd PRUSA i3 MK2S with MMU v1
- 3rd PRUSA i3 MK2S
- 4th PRUSA i3 MK3 with MMU v2- 5th PRUSA i3 MK4 (upgraded from MK3) with MMU v3 (upgraded from…
Re: Crashing on 'improving bed calibration point 2/4'
No, no steel plate during XYZ calibration!
On the other hand, check and adjust the PINDA sensor. It is too high. Turn it down half a turn (clockwise).
Bear MK3 with Bondtech extruder
Re: Crashing on 'improving bed calibration point 2/4'
After clearing the blob did you check your P.I.N.D.A. Probe height? It could have moved a little bit.
See manual for proper height
http://manual.prusa3d.com/Guide/9.+Preflight+check/514?lang=en
Re: Crashing on 'improving bed calibration point 2/4'
Thanks for the replies. I did try to move the PINDA several times. I followed the manual and leveled both size, then brought the head to the middle, then adjusted the pinda. First I had a loose fit, but still on the zip tie. Then I pushed it down harder onto the zip tie.
Also, I saw a mention on a facebook post that if you move your xyz manually that you could fry your RAMBo board. I have to admit I've been doing that because sometimes the print would crash on octoprint or whatever and then when I would start the print again it would think home is in the middle of the bed and then it would go crashing into the right side. So I had to manually move it over to the left while the machine was turned off (but still plugged in.) I would sometimes notice that the LCD would flicker when I did this. Could this really damage the RAMBo? How do I diagnose it?
Re: Crashing on 'improving bed calibration point 2/4'
Hi
I am experiencing exact the same problem. Anybody already found a solution?
Thanks.
o.
Re: Crashing on 'improving bed calibration point 2/4'
I did some more investigation and I found that when the back cover of the E-mount is screwed in there is significant resistance in some portions of the track. More specifically, the bottom two screws can be screwed in tight and not effect it. But if the top two are screwed in even just minimally tight than it will exhibit this issue. The same goes for the center screw, but to a lesser extent.
Here is a video to help you see what I'm talking about.
Does this mean my linear bearings are already shot? Could this cause the calibration to fail in the way that it did?