I’m so TIRED of this issue… No matter what or how I load new filament both P1P’s I have can NEVER resume and start from the last position correctly…
27hr print gone pretty much with a HUGE layer gap on the left side and as if Z is too close on the right…
I thought they fixed this?! Literally this time I watched it run out and when I hit resume after loading it shifted Y -.010" on the left side and a +.010 on the right…
WHY WHY WHY!
I think the bigger question is why BL is not responding. I can find users having this problem back in May 2023 and still no fix or comment. I’m feeling like I have an expensive boat anchor
Most definitely! They’ve went on to blame everything but the firmware or machine… Some people don’t have an issue, some do… Out of 3 machines they’ve all had it occur at least a handful of times. Maybe not consecutively but to the point I can’t trust it to change over and save a print… which doesn’t make this any different than other printers when features don’t work as advertised.
my problem is fixed and everything is working perfectly. i currently running a six day print with over nine hundred color changes and three plus days so far with perfection. I should open a Bambu Lab repair/maintenance shop.
How did you fix it? Enquiring minds want to know?
I had a layer shift on the first color change, regardless if the color change was on layer 1 or any layer the first color change was on. I asked here and received nothing but grief so I am hesitant to use these forums. I provided a test.3mf and was accused of wanting to spread a virus, then I provided a link to the file and received even more grief, then I gave simple instruction on how to create the file and then got complaints for not providing a sample of the problem.
Use Bambu Studio to create a four color cylinder about 40 layers high changing color every 10 layers. the cylinder does not need to have a large diameter maybe the diameter of nickel.
Print the cylinder and tell me if object has a layer shift. Print the cylinder a second time using the same colors but a different order. what are these results? pictures of both tests would be helpful.
are you using an AMS?
It used to happen to me that the layers shifted during the first filament change. I solved the problem by loosening the screws on the belt tensioners according to the instructions, and then tightening them again properly. Maybe the belts were factory tensioned at different strengths… who knows…
What is Your solution???
what is your problem? layer shifting? did you make the 4 color cylinder? what where your results?
Yes i have layer shift after color change, please tell me more about this test, what is to be demonstrated? This is my 1 layer shift problem
please print an object with up to four color changes but more than one. My issue was always with the first color change of every object no matter what layer had the 1st color change. Because I didn’t know if the problem was somehow with the AMS I made a small dime size cylinder that was four colors with each color being 10 layers. It was not the AMS and didn’t matter what color was 1st.
I caught much grief from the forum when I tried to troubleshoot the problem and even more when I provided the file for testing so I am hesitant to discuss my fix on my P1S. I can easily reproduce the problem and the fix has stopped all layer shifts for over the last 2,500 hours of printing, I just finished an object that was four colors and over 1,700 color changes.
Tell me the results of more than one color change. Is the layer shift always the 1st color change? Regardless of the color or layer? Is it only the 1st color change? Can I see your object or objects? While the testing may seem a little silly it proved the problem, solution, and I learned a lot.
I did this test and indeed the shift is only on the first change, what helped in this case?
okay, this looks like the same problem. I believe the problem is the printhead is hitting something when the first color change takes place and this causes the printer to make a small adjustment. This adjustment is either maintained for the entire print or the subsequent color changes are hitting the same thing causing the same small adjustment, idk? My problem was stepper motor covers, I removed them and the problem is gone, reinstall them and the problem is right back. Watch the printhead path right before and during the first color change.
Do you have any mods inside the printer?
what engine cover are you talking about? The only modifications I have are this
I observed the movement of the head and I do not see any impact, only during rinsing the head makes a small step to the right over the garbage can which makes a very loud noise, then it makes 2-3 more, but already gently
The X or Y motors are two stepper motors installed on the back of the printer to drive the toolhead to move in the XY direction. There are mods to cover the motor heads to stop junk from getting in the housing area.
While I know it may be a pain to put the OEM printhead cover w/OEM duct back on and test but you need to start troubleshooting with a stock printer. I think the mod is the problem and caused by the backside of the torodidal cover interferring with the poop chute trap door lever.
Forgot to ask but if the test object you are using has no color changes then there are no layer shifts, correct?
sorry - I think the very loud noise is telling you it’s the problem. The airflow duct is having a problem getting past the trap door. the 2-3 more are just tip cleaning but not opening/closing the poop chute trap door.
I would compare the OEM duct vs the toroidal duct and I bet the toroidal one is bigger on the backside.
I reattached the original air duct, but it didn’t help and the shifting still occurs
Calibrate the printer after doing a good belt tightening adjustment. I power down, loosen the screws, and manually drive the printhead all over making sure I go to each corner a few times, a few figure eight’s and some random swirls stopping with the printhead in the X/Y middle, then tighten the screws.
Stock hotbed plate? A good picture of the poop chute without the printhead parked might help. carbon rods clean?
Here is a link to a video of changing the filament, 2:45 here is the loud shift when flushing the nozzle, see if there is any unusual behavior here
and another one (2:30)
