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Dina, yes, it’s the nozzle size. The smaller hole makes it hard for the filament to push through. The only solution is to increase the temp and slow the print movement down.
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Why didn’t you say that to begin with? A 0.25 nozzle is going to require a lot more pressure to push filament through the nozzle. You need to slow down your print speeds a lot. Put back a 0.5nozzle and see if that solves it.
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Could you attach a picture showing it fail after two layers? when it autolevels do any of the corners deflect down? Maybe the nozzle is dirty and autolevel not working correctly so first few layers too close causing filament to grind.
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Dina, when this has occurred for me, it’s a temperature issue. increase the hot end temperature. Tell the print software to extrude. Monitor the flow. You want to make sure the flow move freely. You can also turn the main extrusion gear and feel the resistance. It shouldn’t push back or feel spring…
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Are you using the default cura profiles? Sounds like retraction might be set to high. You can always call tech support, I believe they are 24hrs
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hi Dina, the first thing to do is to check the nozzle temperature, is it reachin 220Deg C? if it is a mini lulzbot i assume the feeder is in the nozzle-head assembly are you able to feel the filament feeding it?
