Avisos
Vaciar todo

random layer shifts, both X and Y  

  RSS
Mirar
(@mirar)
Estimable Member
random layer shifts, both X and Y

 

I'm getting random layer shifts, on both X and Y axis.

Pulleys are fine, grub screws are fine, belts are fine, many prints are fine. Printing mostly in PLA. Not very complex prints, so no overhangs with snags or anything like that.

X shift seems to be around 1.27mm always, Y shift around 0.84mm always.

 

Anyone have any idea?

It feels like a missed pulse to the steppers or the steppers didn't get enough power. Do the numbers above correspond to something like a number of pulses to the steppers (a full step or a microstep)? It's at least much less than one cog on the belt.

Respondido : 16/05/2022 9:18 am
Mirar
(@mirar)
Estimable Member
Topic starter answered:
RE:

Both x and y and fine and lubricated and moves smoothly. I'm out of ideas.

Can it be drivers giving up? PSU giving up? How do I check?

 

Respondido : 22/05/2022 3:34 pm
Diem
 Diem
(@diem)
Illustrious Member

Check your belt idlers, you'll need to slacken the belts to do so.

Cheerio,

Respondido : 22/05/2022 4:03 pm
Mirar
(@mirar)
Estimable Member
Topic starter answered:
RE:

They seem fine...

 

I have more data. It only seems to happen when the printer moves far distances, and turning down max jerk/acceleration/speed seems to have solved the issue.

I still suspect insufficient power to the motors. Has anyone experienced this before? It worked fine for a few years...

Respondido : 25/05/2022 8:52 am
RC
 RC
(@rc)
New Member
RE: random layer shifts, both X and Y

I'm having a similar problem.  The layer will shift ~1mm, sometimes in x and sometimes in y direction.  I've checked to see that parts are tight, lubricated and running smoothly.  Everything works correctly most of the time except sometimes there is a single layer shift during a print - not always and never at the same z height.  I have checked the LCD display for voltages and all voltages are near 24 V.  I suspect issues with the card reader and the stepper motor drivers but don't know how to further isolate the problem.  Were you able to solve your problem other than decreasing max jerk/accel/speed?

Another "feature" of my issue is that sometimes a print starts and then the system automatically reboots after just a few seconds of printing. 

Another "feature" is that sometimes the x & y movements are obviously slower than normal - like about half speed or less - but x and y movements seem to all be the right distances.

Another "feature" is that during the leveling calibration that happens at the beginning of a print - where the PINDA probes the table 4 times each in 9 places - the z-axis speed at which the print head moves up and down during the PINDA probing is slower than usual.  This seems like it indicates an electronics issue since the movements during the cal shouldn't vary in speed from one print to another.  Also, resetting the system and starting the same print over often resolves this particular issue.

Could all of these issues be related to the card reader getting lots of detectable read errors so that it has to try again on many occasions and thereby slowing down the entire process and sometimes failing altogether?  I have a new SD card on the way.

Any help is appreciated.

 

Respondido : 21/12/2022 4:41 am
Diem
 Diem
(@diem)
Illustrious Member

As above, check the idlers.  What does your print-log say

Another "feature" of my issue is that sometimes a print starts and then the system automatically reboots after just a few seconds of printing. 

This suggest a loose connection or a cracked wire, pull and replug all connectors on the Einsy and if it persists check continuity.

Another "feature" is that sometimes the x & y movements are obviously slower than normal - like about half speed or less - but x and y movements seem to all be the right distances.

This can be just a feature of a particular print - if the same gcode shows varying behaviour that that *might* indicate a problem.

Another "feature" is that during the leveling calibration that happens at the beginning of a print - where the PINDA probes the table 4 times each in 9 places - the z-axis speed at which the print head moves up and down during the PINDA probing is slower than usual.

Is it reprobing because the stored values don't match the measured ones?

As your nozzle wears the distances change, slowly, and you need to recalibrate your first layer Z.  This is normal and may need to be done two or three times in the life of a nozzle.

Work through these and if the slight layer shifts persist come back with pictures.

Cheerio,

Respondido : 21/12/2022 11:28 am
Compartir: