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Hi folks. I obtained a pre-owned Anycubic Vyper. Alas, every print features defects in the surface as shown in the picture. It occurs in any type of material. Does anybody know the source of this type of defects?
Wet filament. Or. Bad filament.
Those are bubbles. Try a dryer.
I already got myself a dryer as I suspected that. But this occurs in multiple filaments, brand new and older ones, different brands. To me it somehow feels like this is not the root cause... But I'll keep an eye on that.
This is also my take on it.
Does the filament exiting the nozzle make a popping sound while printing? Def looks like wet filament (I have absolutely received PETG "wet" in a sealed bag w/ desiccant) but if you to go after the thermistor and heater cartridge I recommend ordering extra, it's a good part to have on hand.
Well, I know that popping sound after having a one year long print hiatus, and cannot hear that while printing now. Thank you for the recommendation of ordering two!
My guess would be hotend not feeling so good. Those white spots look like result of temperature changes.
If you can read hotend thermistor data somehow (OctoPrint, for example, shows a chart for that) and see lots of sudden ±2-5°C changes - that'd be it.
Yeah, that's what I observe in octoprint. Do you also know how to fix?
This might be thermistor losing contact with the block or wires losing contact. It can also be the heater wires losing contact somewhere. To diagnose, you can try and wiggle the wires when you preheat the hotend and watch the temps. Then you will know what needs replacing. I once had a thermistor that was faulty, I replaced it, the problem went away.
Replace the resistor and temp sensor. I would also replace the hot end itself, at least for my printer it was like 10e
Weeeeeeell the last time when I tried to replace the hot end, I screwed up so hard the printer was not usable any more after that 😂
How...? Mine is literally 2 bolts and the bowden tube retaining bolt? Plus of course the sensor and resistor cartridge. I have no experience of direct feed hot ends tho.
You can try running a PID tune on the nozzle and see if that helps.
Unfortunately, the temperature variation still is above 3° C.
Ok, I never heard of that and read into it. As this is there easiest thing to do, I'll do this ASAP and see of it works.
Did you dry your filament? How old is it? Did you get all your filament pre-owned as well? Depending on the kind of material, it has a limited shelf life, once you get beyond that it won't ever print right.
Try some brand new filament and see how that works.
The filament is brand new, I also tried other brands and types of different age so I assume it is independent of the filament.
I got results kinda like that before when I tried a Volcano on an old Bowden style printer and printing wet PETG... Tons of oozing.
Well, the PETG is brand new and I use a heated chamber for the filament, so I really hope this is not the case. But as the setup sits in a basement, I'll try to check that, too.
Do not underestimate PETG's moisture absodbage it can also get too wet (theoretically, personally hasn't happened but I don't keep my filament for long before printing) if it is even sealed as most bags aren't 100% airtight IIRC.
That is true. That is why I bought that filament drying chamber. I'll keep an eye on that.