MK4S to CoreOne Z axis failed over and over
I read another post about this and they had an issue with the nozzle. I tried that and still no luck. I have adjusted the trapezoidal nuts to move them up higher and to make sure the level of the bed is true using a level and still getting the same fail. No error code or anything on why it just fails. Any help is really appreciated and willing to try just about anything. Only thing holding me back. Not sure what was worse, the 5 months waiting for the kit to ship or having done the change over and being stuck on this one detail.
Best Answer by Jürgen:
IT goes to the Z axis calibration and starts moving the motors slightly when it is in the lowest position and after a few moments it starts to raise the bed. IT will take it almost all the way to the nozzle but slows way down. Starts stepping up to the nozzle then I see where it touches it. Once that is complete it will lower itself and show the red X.
Those knocking sounds at the beginning and end of the movement are not right. It sounds to me like the Z drive is close to jamming.
A frequent cause for this is that the black POM nuts want to force the heatbed into a lateral position that differs from what the smooth rods and their linear bearings define. With the heatbed in the lowermost position, loosen the 3*2 screws which hold the black POM trapezoidal nuts in place, to let the nuts find a position that is consistent with the smooth rods. Then tighten the screws again -- don't overtighten them to avoid deforming the POM nuts.
Hopefully this will fix the Z movement and calibration error. Many users have found that the Z drive can still get noisy during long travels, making "groaning" noises. Lubricating the lead screws with some of the grease included in the kit has helped in these cases. (Even though the POM nuts are supposed to be self-lubricating.)
RE: MK4S to CoreOne Z axis failed over and over
Check your motor pulleys. It's a very common problem for folks to put those pulleys on in the same direction for both X and Y.
Look inside the printer - on the left is the X axis motor. If you look into the hole on the right side of the motor holder, you should see the shoulder of the pulley (the part with the grub screws). Then look on the right to the Y axis motor. Looking into the same hole, you should see the top of the pulley with the teeth.
If you got one upside down, you wouldn't be the first.
RE: MK4S to CoreOne Z axis failed over and over
Check your motor pulleys. It's a very common problem for folks to put those pulleys on in the same direction for both X and Y.
Look inside the printer - on the left is the X axis motor. If you look into the hole on the right side of the motor holder, you should see the shoulder of the pulley (the part with the grub screws). Then look on the right to the Y axis motor. Looking into the same hole, you should see the top of the pulley with the teeth.If you got one upside down, you wouldn't be the first.
It's indeed a common assembly error, but it is unrelated to the Z axis, right?
RE: MK4S to CoreOne Z axis failed over and over
I read another post about this and they had an issue with the nozzle. I tried that and still no luck. I have adjusted the trapezoidal nuts to move them up higher and to make sure the level of the bed is true using a level and still getting the same fail. No error code or anything on why it just fails. Any help is really appreciated and willing to try just about anything. Only thing holding me back. Not sure what was worse, the 5 months waiting for the kit to ship or having done the change over and being stuck on this one detail.
Could you describe a bit more what happens?
- At what point in the process does it fail?
- What movements do you observe?
- How does the failure manifest itself?
RE:
Yes I just doubled checked that and the motors ore correct and the pulleys were correct when looking in the holes. I even just went back and redid all the nuts on the bed while elevated and tightened everything down and tried the calibration again an d it failed once again but once the bed lowered it stopped where I had the bed elevated to when attaching the nuts. I have even double checked the board on the front and everything on there is correct. At a total loss here as everything seems to be where it should be.
RE:
I am not sure how to explain it but it seems to do everything correctly and it was printing just fine on the MK4S before it was tore down as I printed the bearing lube tool. IT goes to the Z axis calibration and starts moving the motors slightly when it is in the lowest position and after a few moments it starts to raise the bed. IT will take it almost all the way to the nozzle but slows way down. Starts stepping up to the nozzle then I see where it touches it. Once that is complete it will lower itself and show the red X. You can also see where it starts and finishes as it never goes below that location even though this was the repeat of the nuts and having it raised this time to attache them.
I dropped a video of it over on Youtube as it was was too big to send it here. https://youtube.com/shorts/5huVkvaAAEo?si=H9srGRMLPYAJHiKQ
RE: MK4S to CoreOne Z axis failed over and over
Yup, you're right! Silly mistake.
Check your motor pulleys. It's a very common problem for folks to put those pulleys on in the same direction for both X and Y.
Look inside the printer - on the left is the X axis motor. If you look into the hole on the right side of the motor holder, you should see the shoulder of the pulley (the part with the grub screws). Then look on the right to the Y axis motor. Looking into the same hole, you should see the top of the pulley with the teeth.If you got one upside down, you wouldn't be the first.
It's indeed a common assembly error, but it is unrelated to the Z axis, right?
RE: MK4S to CoreOne Z axis failed over and over
Two things I do notice though are that the left trapezoidal nut is really tight when in the lowest position until you get a little ways up then moved freely and does not slide right down into the base easy either. On the right side the Z rod does make a whole lot more noise and moves more than the left(as in side to side almost like it is not true straight)
RE: MK4S to CoreOne Z axis failed over and over
IT goes to the Z axis calibration and starts moving the motors slightly when it is in the lowest position and after a few moments it starts to raise the bed. IT will take it almost all the way to the nozzle but slows way down. Starts stepping up to the nozzle then I see where it touches it. Once that is complete it will lower itself and show the red X.
Those knocking sounds at the beginning and end of the movement are not right. It sounds to me like the Z drive is close to jamming.
A frequent cause for this is that the black POM nuts want to force the heatbed into a lateral position that differs from what the smooth rods and their linear bearings define. With the heatbed in the lowermost position, loosen the 3*2 screws which hold the black POM trapezoidal nuts in place, to let the nuts find a position that is consistent with the smooth rods. Then tighten the screws again -- don't overtighten them to avoid deforming the POM nuts.
Hopefully this will fix the Z movement and calibration error. Many users have found that the Z drive can still get noisy during long travels, making "groaning" noises. Lubricating the lead screws with some of the grease included in the kit has helped in these cases. (Even though the POM nuts are supposed to be self-lubricating.)
RE: MK4S to CoreOne Z axis failed over and over
OK So not sure what happened or what I did but I took the nuts off and greased the rods and put the nuts back on and tightened them and then backed them off one turn. It now completes with all green check and now to work on why my RGB Light and printer is stuck in a down load state when I try and send to the printer. That is more troubleshooting on my part now.
Thank you all for your help and suggestions.