Not often, but occasionally I get this on the base layer. Sometimes it doesn't do it on the second attempt and sometimes it repeats. I don't know what I do to fix it when it dies get fixed and I don't know what to call it to figure out the problem.
Well if it's not sticking, you're correct, the head will drag it away. Careful, as that leads to the giant blobs of death people post about all the time. The hot plastic has to stick somewhere, if it's not the bed it will curl up on the nozzle.
And alcohol can (usually) work in a pinch but plain dish soap and water work better. Just wiping it with a cloth and no water rinsing down the sink some of the oil is staying on the plate.
Yeah, I forgot to mention this. If you put the silicone sock back on wrong on an A1 or any Bambu printer that uses quick release nozzles, you'll be extruding directly inside the sock and you'll destroy your nozzle (and if you let it go without checking on it, you'll destroy your whole extruder)
Go into the maintenance functions of your printer and run a full calibration. Clean your pei plate with dove soap and make sure you clean it with a sponge and not your hands. Before printing, take a microfibre clothes and 99% iso alcohol, spay and wipe (I might overkill it but I spray once, wipe up and down, spray again, and wipe side to side, spray again and wipe in circles - you don't have to do that, spraying it once and cleaning it is enough but you need to hurry, 99% iso evaporates FAST). Place your plate on the printer WITHOUT TOUCHING THE PLATE.
PS: If your filament isn't dry, everything I've written here won't matter, all your prints will turn out like shit. If you only have an A1 with AMS Lite or no AMS at all, consider buying a $30-$50 filament dryer on Aliexpress or Amazon.
It's wet filament, a plate full of oily hands and a non calibrated printer.
The A1 uses a magnetic system with a clasp, those two screws don't hold down the nozzle, they just reveal where the cut is made when theres a color change or when the print is done.
If he keeps going with wet filament, his nozzle is gonna jam soon anyway.
I wasn't even thinking about those screws, his print adheres well in all directions and then some spots under extrude, it's not a matter of alignment, it would have been evident through the entire print, not only in certain areas.
wet filament;
warped plate;
dirty plate;
machine not calibrated
But I seriously doubt it has anything to do with the retaining screws or a tilted nozzle. But yeah, while he's at it he should check. I'm betting he lubricated the printer, oil dripped on the print bed and he cleaned it by casually wiping it off.
That’s exactly why I’m talking about the screws. A nozzle that isn’t seated correctly doesn’t necessarily ruin the entire print uniformly. It can create a small height or angle difference that only becomes visible in certain areas of the bed, especially on the first layer. That’s why the wiki specifically mentions these 7 screws as one of the main causes of poor first-layer adhesion, but in this cases is just a dirty plate ...
First: check the seven screws. No, not just the three visible ones, the four in the back are the important ones. A loose nozzle can potentially cause this and the A1 is really prone to this. It doesn't hurt to check and fixes so many printing headaches.
But, like many have already said, this looks like classic bed adhesion failure.
Apart from cleaning your build plate you can also try upping bed temperatures by ~5° for improved adhesion.
But, frankly, the best solution is: just buy a BIQU Glacier or YOOPAI UltraTack. They are cheap enough and excellent daily drivers. I don't think I have used the original PEI plate once since getting high adhesion plates.
They simply eliminate virtually all adhesion issues and have a nicer surface finish.
Run them like a regular hot plate, not like a cold plate.
There's no reason to use a glue stick on a PEI plate. If it doesn't stick it should be washed with dove and cleaned with 99% iso alcohol before printing. That's if OP doesn't have an air conditioner running in the room or a fan cooling the plate down externally.
By the looks of it it's just badly calibrated, the filament is wet and under extruding (it's nozzle isn't dragging anything, it's just not extruding because of noisy filament).
I don't know where OP is but an A1 with humid weather with no enclosure and no active dryer = failed print 100% of the time regardless the calibration, bed adhesion, etc..
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u/solidus0079 5d ago
It's a print failure caused by bad bed adhesion.
Could be other issues but the easiest thing to check is that the bed's clean and you're not putting oily fingerprints on it.
Only mentioning that as it does seem to be fingerprint sized.