Extreme layer shift on print
Hi,
I'm running firmware 6.3.3+10442
Sliced in Prusa Slicer 2.9.2
0.6mm HF nozzle
0.4mm speed profile
I printed this part yesterday without issues. It is a spacer to elevate a cleat a bit higher off the deck of a boat. But today at 21mm/40mm the printer suddenly 'forgot' where the print head was. When I stopped the print the printhead crashed into the right of the axis because it though that it was way further left.
It was the same gcode both times. Is this just a case of bad luck? Did the printer get confused about its position because printing the cubic infill drags it along itself? Did the prusa USB stick corrupt the gcode?
- The only things I did between the first and second print was:
printing a hole test (8.0mm up to 8.5mm) because I misjudged the tolerances a bit. But I decided to just print the same gcode again and just drill out the holes a bit for the M8 bolts. - Deleted a few other versions of the same part through Prusa Connect in Prusa Slicer. (those were attempts that failed because I had mounted a non HF 0.6mm nozzle by accident)
Is there anything I can do to prevent this from happening in the future?
Best Answer by ShadoKitteh:
In the end I fixed it by not using cubic infill (I used gyroid instead). I think that caused blobs of plastic to build on the nozzle. On one of the failed prints there was a 3mm high blob on it that could have caused the issue.
Blob deposit
I think I just got really lucky the first time because that time there were 2 blobs laying next to the print.
Another reminder to myself to never use cubic again.
RE: Extreme layer shift on print
I had a similar thing happen when I was printing PETG-CF. A combo of using Stealth mode, slowing down speeds, and increasing retract heights seemed to help mine. Original thread below:
https://forum.prusa3d.com/forum/prusa-core-one-how-do-i-print-this-printing-help/glitch-in-the-matrix-how-did-this-happen/#post-754862
RE:
In the end I fixed it by not using cubic infill (I used gyroid instead). I think that caused blobs of plastic to build on the nozzle. On one of the failed prints there was a 3mm high blob on it that could have caused the issue.
Blob deposit
I think I just got really lucky the first time because that time there were 2 blobs laying next to the print.
Another reminder to myself to never use cubic again.
RE: Extreme layer shift on print
Another reminder to myself to never use cubic again.
Cubic can be great, but it's a "self crossing" infill type and isn't great, when using the full speed of the Core One.
If you need the rigidity of Cubic but want to use higher speeds, try Honeycomb.
I personally tend to use more perimeters and top/bottom layers, when I need stability and if I also need speed, I use Rectangular infill. Honeycomb is my favorite when speed doesn't matter too much.
RE: Extreme layer shift on print
I recently had a massive layer shift issue which seems to been solved by setting "Ensure vertical shell thickness" to "disabled". It somehow made a forbidden movement and motor skipped like 100 steps in a split second or something(I heard the scream from it's place in a closet while I was in the bathroom quite a distance away).
Other people have reportedly said that unticking "avoid crossing perimeters" solves it.
I think once you've ruled out the hardware it's a matter of sitting down with the slicer. I found my suspect by counting layers to where it approximately happened. Since it happened at around the same percentage everytime. I just watched the tool path in prusaslicer, saw something I found odd and found the setting for said oddity. And it did the trick for me.