Odd layer shift with video
Bit of an odd one, was printing overnight and there appears to have been an extreme layer shift for maybe 40-50 layers and then it carried on as before??
Any ideas about what might have caused this?
RE: Odd layer shift with video
Place a straight edge on the bottom of the part you pulled off the bed, the one with the shift. I suspect you'll find it is NOT flat.
Large parts like that will warp. Bed must be spotless (yours isn't, I see fingerprints); and the bed needs to be warmed up 5 to 10c to help keep the adhesion stable.
When the part warps, the nozzle crashes into it and stalls the motors N steps. After the stall, the printer has lost track of where home is, so starts printing N steps away from where it should.
ps: here's what a warp looks like:
RE: Odd layer shift with video
Ah, great advice that makes total sense now - you're right, was being a bit lazy as fairly new pei sheet so thought I could get away with it...!
When you say warm up bed 5-10C, I assume you mean above the normal (it was standard 60C, so do you mean 65-70C?
RE: Odd layer shift with video
When you say warm up bed 5-10C, I assume you mean above the normal (it was standard 60C, so do you mean 65-70C?
Yes... I run 70c now when printing larger parts that have square corners. I also wash the PEI well with soap and water before starting the print. Once in a while I'll even keep the cooling fan down at 50%, hoping the part cools a bit slower. I can't say this solves every print, but the frequency of failures is way down.
RE: Odd layer shift with video
Big flat parts need a big brim, attached to the object.
Also you could do extra or if needed, use glue stick.
Clean the pei with dish soap 1x a week, and between print with alcohol, this for pla.
And first layer should be perfect, to stick better to the bed.
Also small parts need a brim and glue stick, if only a small part of the model is on the bed.