occasional layer shift / Belt shifting
As you can see, can happen in the mide of the print. Very annoying.
Pulleys are tigthened firmly.
Where else can I check ?
22 Replies
Vcore 500 with bondtex extruder
All seetings under performance mode. Perhaps I should reduce non printing move speeds ?
What typical checks should I do ?
Perhaps its a travel speed issue ? I reduced from 500 to 400 ms
What accel is your slicer set to?
default 4400
sorry 6000
grub screws are well tightened I believe
I'm not sure. Maybe you'll need to go very low for a 500? I see that many of those accels are set to 120%, which is considerable in this case. I'd double check that the grub screws are in correctly. Does the issue occur when you run super slow?
Hello reduced max velocity but again a belt shift. This happens once or twice but its enough to ruin my print....
I am not sure which acceleration setting is the culprit. I guess i can try to print to opposite shapes and see why setting takes away the retractation
Is there a way to distinguish acceleration from max printing speed issues ? I will redo the prints with loyer accelerations to see if the problem persists
I reprinted at slower speed and got a layer shift at the exact place
What can explain a layer shift occuring at the same exact layer ?
That it is doing a particular move that is causing the shift.
Most likely a diagonal travel move
I an printing now with z lift at 0.5mm, it may have sorted this issue on that layer (i have two instances of shifting on that print)
Z hop is very annoying thoughn creates a lot of mess
If it is indeed a diagonal move, then I guess its not entirely a mechanical issue, or maybe the mechanics cant follow the diagonal love
Move
In which case I guess i can slow down a lot the print before and after the guilty layer (?)
What performance settings do you have selected?
Need to make sure the motor run current is high enough
tmc2209-perfomance.cfg
Ok i think i know whre the issue comes from
Petg is oozing ending up by creating a blob
That blob holds the nozzle enough to cause a layer shift
Just happenend now
Run_current is set at 1.6
Can i increase it to cleae out this kind of issue ?
I am surprised though that a fresh blob can cause layer shift
So found the culprit. Blobs are for some reason derailing the nozzle
I didnt that possible given the strenght of a stepper
Changed the nozzle hopefully a new tightened nozzle will have less oozing
That's a pain. I'd make sure to confirm esteps and pressure advance so that you can rule that out
Never heard of that issue
Usually when the nozzle crashes it will dislodge the print
Thank you for you kind support on that issue
Sorted out the issue, there was in fact 3 problems
Nozzle base was leaking, creating blobs. Replaced and tigthened a new nozzle. No more blobs
Pressure advance was too high, ultimately creating blobs. Reduced PA
Aaaand a grub screw was indeed loose...screwed it back firmly on the flat surface of the stepper rod
Print is almost done and no more belt shifting
Thanks again and have a good day ahead
I find a little blue loctite helps keep them in place
Thanks will try that
One last question. When experiencing a layer shift, is there a way to rectify the situation during the print ? I mean pause the print and adjuste the printhead position back to where it is meant to be ?
no, since you have no way to determine the correct position
Ok thanks