this post was submitted on 06 Jul 2025
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Any videos of when the print fails? Is it all prints or just the Benchy? Does it always fail at the same height?
From the available info, I'd guess it got knocked off the bed because the nozzle hit the curled overhang, which indicates the first layer is too high, decreasing adhesion, and the fan is not blowing enough, so the overhangs don't cool enough, which allows them to curl upwards and get in the way of the nozzle.
More info = better diagnosis.
Everything is failing. There are definitely collisions happening.
How do you reduce the thickness of the first layer?
Lower the Z offset. Not by too much, or it'll scratch the bed.
"Everything is failing" is not useful info at all. Post a video of the failure happening if you don't know how to describe it.
Ok, I am having trouble uploading the video. Anyway, all of the prints will be fine up to a point, then detach. The nozzle is colliding with the models. In some cases, I can see the model being pushed down on one side or other by the nozzle before it detaches.
Yeah, if the nozzle is hitting the part, then it's very likely a cooling issue. If an steep overhang isn't cooled properly, it'll curl upwards.
Either you're printing too hot, or the fan is too slow or failing. For PLA, you can leave the fan at 100% after the first or second layer, and print between 195 and 205°C. Printing too fast also means the fan may struggle with the amount of hot plastic.
Can you paste your slicer settings?