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my models keep getting knocked off. what to do? (lm.boing.icu)

submitted 11 months ago by admin@lm.boing.icu to c/3dprinting@lemmy.ml

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Hi, I'm new to printing. I got myself a Kobra 2 and it was printing fine when I got it. But recently it started to knock the prints off at random times. I have done several recalibrations, adjusted the Z offset up and down. What I have noticed is that all of these models seem to have a small overflow of material which I'm guessing the nozzle is bumping into. But I have no idea what causes it. I'll post the latest print that failed, there the extra material is more pronounced than usual. Any suggestions what I should adjust? (Btw I'm using Octoprint)

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[–] IMALlama@lemmy.world 4 points 11 months ago

Post a picture of your first layer, or just the underside of this print. It looks like your nozzle is quite a bit too high, but it's hard to tell.

Since you said you had good adhesion before (with the same filament, right?), here are some things to look at:

clean your bed! If it's removable, dish soap works well. IPA also works well, but you want the 90% or 95%
first layer squish. Too much will give you elephants foot. Too little will result in poor adhesion
have you changed your bed and/or first layer temperature?
have you changed your first layer speed? Slow is good