RE: Z axis trouble but only when printing
During the installation of the camera, I took the opportunity to disassemble the main cable and inspect it thoroughly. Nothing suspicious was noticed. I made sure to followed all the steps meticulously. Everything has been reassembled now, and just this morning, I performed three tests without encountering the problem again.
I'll be crossing my fingers that it doesn't return, but more importantly - I no longer need to frequently change the G-Code whenever Prusa modifies its configuration in Prusaslicer.
RE: Z axis trouble but only when printing
main cable
Do you mean the "Main FE cable" from the assembly manual?
Great to hear that your print was successful!
RE: Z axis trouble but only when printing
RE: Z axis trouble but only when printing
Oh man.. thanks, my brain was already sleeping, sorry.
RE: Z axis trouble but only when printing
So after much experimentation, I've determined that the back right of my Core One upgrade is not usable if it has to be probed. The printer will not pass a probe sequence if it has to probe the back right corner. If I place a small print in the center where the back right doesn't have to be probed, the print will succeed. If for any reason the printer has to probe the back right, MBL fails and the print won't start.
RE: Z axis trouble but only when printing
Just to be sure: back right = NOT where the print bed cables are?
If yes: probably the filament sensor/cable/ptfe tube being in the way of the Y-bearing-bracket.
If no: probably the print fan duct hitting the print bed cable cover.
RE: Z axis trouble but only when printing
There is no contact with the gantry arm, print head cable, or print bed cable at any point in the range of motion.
New Development
Stacking two buildplates allowed the 49 point probing sequence to complete without error. If i remove one of the build plates, the probing fails each and everytime int he back right corner. Can we get some data from others on this? Generate a print file that fails consistently, stack two build plates and run the file again and let us know if the probing completes.
RE: Z axis trouble but only when printing
Update: Lowering the nozzle ~1mm using the thumb screws also allows the probing sequence to complete without issue.
RE: Z axis trouble but only when printing
@discojon, this sounds very much like the "heatbed cable cover touches the Nextruder fan shroud" issue. I understood you to say in the other thread that there is no contact -- but could you please double-check? Nextruder in the back/left position.
RE: Z axis trouble but only when printing
Just to add to this: the "nozzle loadcell" is basically the whole nextruder frame, so if you apply pressure anywhere on the print head, it'll think the nozzle has hit something.
So if stacking print sheets helps, there's definitely "something hitting something" going on with just one sheet.
RE: Z axis trouble but only when printing
Can you show me a photo of what exactly you are referring to? I don't see any contact anywhere but I may be missing it.
RE: Z axis trouble but only when printing
I build a Prusa Core kit and I have a problem with the Z axis: ther is a high difference bettween the front and the réarmement Z axis : 3 mm. So when I want to Print, the wipping Print!ng head is ok but when the calibration plate begin, the error message appear and the printing cycle stop : impossible to levelling. Today, Ihave no solution. Is it possible to help me? Thank you and best regards.
RE: Z axis trouble but only when printing
I build a Prusa Core kit and I have a problem with the Z axis: ther is a high difference bettween the front and the réarmement Z axis : 3 mm. So when I want to Print, the wipping Print!ng head is ok but when the calibration plate begin, the error message appear and the printing cycle stop : impossible to levelling. Today, Ihave no solution. Is it possible to help me? Thank you and best regards.
Vertical calibration is first achieved by the printer lowering the bed to the very bottom and continuing - so that the motors skip - in an attempt to ensure all 3 are at the very bottom. Then the bed is lifted in sync (all 3 motors are driven in unison) until it senses it touching the nozzle.
If, for whatever reason, the bed bottoming out isn't level, you will have a tilted bed - always - and bed probing will accommodate and adjust the height during printing so that it appears level in relation to the nozzle at all times.
You need to determine why the bottoming out process results in a tilted bed. Check that all the motor mount screws are tight to the bottom plate as it is these that the bed mount bottom out on to.
As you are out by 3mm I would lower the bed to the bottom, turn off the motors, and then manually turn the threaded rods to ensure that all 3 are at the very bottom. Then do the z axis calibration from scratch. It could be that you are so out that not all the motors bottom out (although unlikely).
Then raise the bed so that is is close to the nozzle and, again with motors turned off, manually move the gantry around and eyeball the nozzle distance from the bed. If you do see a difference you have something misaligned somewhere.
Finally, loosen your nozzle thumb screws, push the nozzle fully up, lower it 1mm and tighten the thumb screws.
RE: Z axis trouble but only when printing
Perfect solution! Without this custom g-code: homing errors till crash message. With it: quick start and solid print! MK4s to Core One Kit in my case.
Thanks for sharing. I hope Prusa delivers quick a new firmware…