I’m having an issue with the default settings for PETG at 0.12mm layer height. The default 0.2mm layer height settings have always seemed to work fine for me. This is the first time trying the finer layer height. I didn’t do anything special, just selected the different layer height preset, sliced it, and let it go.
My print had little plastic crumbs all over the bed at the end of the print (they are on the floor of the printer in the photo because I blew them off at the end of the print). I was able to see the crumbs forming at the nozzle as it was printing. They would form just beside the nozzle tip, break off, and another would begin forming. At the end of the print, there is a blob of material on the nozzle.
Have you dried the filament? This is how it looked for me when I had some wet PETG. Unfortunately not all filament is dry out of the bag, in fact I dry every filament I want to use first!
I can try drying it out. However, I would expect the issue to persist in other presets if that were the issue. This issue has only just occurred when I switched to the 0.12 fine layer height preset.
drying the filament , wet PETG filament will have more issue if layer height is smaller
reduce the speed PETG does not like any speed above 140mm/S and really is under 100mm/S
flow is slightly higher probably start by reducing it by 0.005 . PETG a bit overflow may build up on the nozzle and causing issues
last check the cooling and temp profile - could be a bit tricky here - mine settings 10% -30s, 40%-60% 8s, 90% overhang, 100% supports , chamber in the advanced for filament M106 P3 S150 (60 %), Aux 0% some times 10% , Nozzle 15C-20C above the recommended for the filament for me that is 255C or 260C , i use more often 255C but some objects do increase it to 260C
Not sure about the 2 and 3 which one is better to try first , but start with drying
Number 4 is unlikely as the over hang looks good , but AUX fan can affect it really badly
Imagine drying hundreds of filaments. It could take months. And you should start again when you’re done.
All we need is top quality filaments.
And top quality printers. According to my experience Bambu Lab X1C is very far from that.
It does take a while to dry lots of filament but it’s not that bad. If you store the dried spools in moisture proof containers after drying, they are good for a very long time. I have cheap hygrometers and a fresh sachet of silica gel beads in all my containers. All have the hygrometers pegged at the lowest humidity the hygrometers can display - 10%.
I assume you mean top quality “dry” filaments. It sure would be nice if they did arrive dry but even if they did, filament absorbs water out of the air. If your humidity is high, top quality filament can easily absorb enough water to start acting up. Dry storage is important.
Something to keep in mind is silica gel desiccant absorbs water when it sits out too. Put silica gel that has been sitting out into a container with “dry” filament and it’s just like pouring water into the container with the filament. Silica gel absorbs and gives off water pretty much equally well. Whenever putting silica gel in with filament to keep it dry, the silica gel needs to be dry itself or it can just be a water source.
Don’t know why filament arrives with significant amounts of moisture in it but it does. Depending on how much water and conditions, you can have issues from moisture or not. Dry filament really helps prints, though.
“Wet filament” is unfortunately more than just bad mantra and it’s kind of short sighted to think your experience extends to everyone else. Not everyone has the same experiences. Much depends on the local environment, how/if filament is dried, and how it is stored. You may not have wet filament issues but others do. I did until I got up to speed on how it all works.
Two examples. PLA was all I was printing at first and I got some filament in from Bambu that printed badly and showed moisture effects. Drying it took it from printing poorly to printing well.
The photos of the white parts were the same print file printed in PETG HF with another fresh spool from Bambu. The surface was doughy looking, it had the odd ridges on the surface, corners lifted, and it was stringy. The second photo is with the same spool of filament after drying. Smooth, flat, no lifting, very minor stringing.
So no, it’s not just bad mantra. For some it’s reality and prevents them from getting good prints. Many cases are much worse than my own experience. So please, stop with telling people yours is the only valid experience because it isn’t.
I didn’t say that. After 4+ years with 3D printing, no drying ever.
I have purchased X1C two weeks ago. I experienced extreme stringing. People in this forum adviced me to dry the filament. I dried 3 Bambu Labs filaments using the X1C’s utility. Drying didn’t help at all. Then I changeg Z hop and retraction. No stringing after that. And I tried it with non-dried filaments as well. All good.
But… maybe I’m just a lucky boy.
That might work with PLA then, but in my experience, PETG and especially TPU need to be dried. Just today I thought, “I don’t need to dry this PETG, my house is reading 20% relative humidity!” Note, I was wrong. Normally beautiful prints, but this one is all stringy and ugly.
Maybe you are. First, drying filament in the printer is still subject to ambient humidity and if your humidity is high you won’t dry much. If your filament is already dry you may even add water. It’s the same reason clothes take longer to dry on humid days, why sweat doesn’t evaporate as easily on humid days.
There is more to drying filament than just time and temperature.
And yep, you can adjust out some issues, but you can’t adjust out popping and sizzling. That you could adjust out the bad behavior does not prove your filament is dry or your techniques work well for everyone else. That’s all I’m saying. Someone asks about water and people show up and say “I don’t have that problem” isn’t being especially helpful.
Lucky for you that you are in a local climate that helps you and you don’t print the harder stuff like PETG HF. Not everyone has the same experience.
