Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?
 
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Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?  

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prusanewuser
(@prusanewuser)
Honorable Member
Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?

Hi, I change filaments manually in the middle of the print. Once in awhile, after I changed the filament and pressed the knob to resume the print job, I heard a loud noise but the print job continued. Upon completion, I saw layer shift, along the Y-axis, around the layer where I changed the filament. The loud noise sounded like there was a collision but before I started the print job, the extruder moved smoothly and freely along the X and Y axes and there was nothing blocking the path of the heat bed. What could be the cause? In one print, I changed filaments twice. The first time with that loud noise and the second time had no such noise. The Y-axis belt is within acceptable range according to the Tension Meter and belt test.

Best Answer by fuchsr:

Could it be that after executing a M600, somehow the extruder accelerated too fast to resume the job?  

Never heard of this. Should be a common problem if it occurred.

If there were obstruction, shouldn't that happened in other layers as well instead of the exact two layers were I changed filament?

Yeah, I know, that's where my guess was weak 🙂 

I just couldn't come up with better ideas for a *loud* noise. Could it be hitting infill on the travel from the nozzle to the resting place and/or back? Sure, in particular if you're using an infill pattern such as grid where filament lines across within a layer and can cause pile-ups at the intersection. But that would be more of a soft thud than a loud noise.

This topic was modified 2 months ago by prusanewuser
Posted : 12/08/2022 7:20 pm
fuchsr
(@fuchsr)
Famed Member
RE: Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?

A loud noise indicates a mechanical issue. I'd carefully inspect the path of the sheet along the Y axis to make sure there's no obstruction. If it continues to happen, a video might be helpful.

Posted : 12/08/2022 8:01 pm
prusanewuser
(@prusanewuser)
Honorable Member
Topic starter answered:
RE:

Yes, you are right that it indicates a mechanical issue. Besides obstruction along the path, is there another possibility? Could it be that after executing a M600, somehow the extruder accelerated too fast to resume the job?  I didn't notice any obstruction along the path. In the last print, both layer shifts occurred at the layers where I changed filaments. If there were obstruction, shouldn't that happened in other layers as well instead of the exact two layers were I changed filament?

This post was modified 2 months ago by prusanewuser
Posted : 12/08/2022 8:11 pm
fuchsr
(@fuchsr)
Famed Member
RE: Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?

Could it be that after executing a M600, somehow the extruder accelerated too fast to resume the job?  

Never heard of this. Should be a common problem if it occurred.

If there were obstruction, shouldn't that happened in other layers as well instead of the exact two layers were I changed filament?

Yeah, I know, that's where my guess was weak 🙂 

I just couldn't come up with better ideas for a *loud* noise. Could it be hitting infill on the travel from the nozzle to the resting place and/or back? Sure, in particular if you're using an infill pattern such as grid where filament lines across within a layer and can cause pile-ups at the intersection. But that would be more of a soft thud than a loud noise.

Posted : 12/08/2022 8:22 pm
prusanewuser
(@prusanewuser)
Honorable Member
Topic starter answered:
RE:

The print was located at the far right of the build plate (in relation to my point of view in front of the printer). If I recall correctly, the extruder was at the far front during the filament change. Immediately after I pressed the knob to resume the print, I heard that loud sound.

I will keep an eye on this when I print again. Thank you

This post was modified 2 months ago 2 times by prusanewuser
Posted : 12/08/2022 8:40 pm
prusanewuser
(@prusanewuser)
Honorable Member
Topic starter answered:
RE: Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?

 

Posted by: @fuchsr

Could it be that after executing a M600, somehow the extruder accelerated too fast to resume the job?  

Never heard of this. Should be a common problem if it occurred.

If there were obstruction, shouldn't that happened in other layers as well instead of the exact two layers were I changed filament?

Yeah, I know, that's where my guess was weak 🙂 

I just couldn't come up with better ideas for a *loud* noise. Could it be hitting infill on the travel from the nozzle to the resting place and/or back? Sure, in particular if you're using an infill pattern such as grid where filament lines across within a layer and can cause pile-ups at the intersection. But that would be more of a soft thud than a loud noise.

Previously I replied to your post based on fault memory. I printed again and paid attention to what happened. You are right that the nozzle hit the print. My apology. 

Posted : 14/08/2022 1:10 pm
fuchsr
(@fuchsr)
Famed Member
RE: Why sometimes layer shift along the Y-axis occurs after filament change in the middle of the print?

That's not uncommon for some infill types and/or when you have a bit of curling/warping. I mostly use gyroid or adaptive cubic infill, which don't have intersecting lines. 

Posted : 14/08/2022 1:57 pm
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