PLA overhangs are utter mess

OK. Dunno what I'm doing wrong. But this is what I get from overhangs. 200C, 60C bed, 4028 fan on 50% overhang printed at 33mm/s Any questions, anything, I can add. please, shout .. It's like the PLA "doesn't stick" ..
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34 Replies
eastern-cyan
eastern-cyan•13mo ago
Would be great to have better pictures, I can't figure out anything on the current ones First one is vertical wall, isn't it?
KaylebPrdelni
KaylebPrdelni•13mo ago
I'll post better ones. Yep, the first is outer wall, so effectively "top surface", second is inner wall, so "overhang" if you will, though the slope is 45deg ...
KaylebPrdelni
KaylebPrdelni•13mo ago
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eastern-cyan
eastern-cyan•13mo ago
Ok, if I understand correctly, the issue with wall angled 45 (or so) degrees to heated bed, it is bad both inside (overhang) and outside (external perimeter). Is that correct? Hot thick this wall? Home many perimeter? Can you show it in slicer?
KaylebPrdelni
KaylebPrdelni•13mo ago
correct. four walls on the slope. the overhang one has fan turned on.. part of the slope for reference
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eastern-cyan
eastern-cyan•13mo ago
Outer wall first? Can I get the link for the model? Interesting to check it in the slicer. Overall, this design must be problematic, I would try to crank cooling to maximum
KaylebPrdelni
KaylebPrdelni•13mo ago
I tried both inner-outer and outer-inner. Inner-outer turned out tiny bit better. But 💩 nevertheless. https://www.printables.com/cs/model/296322-v-core-3-12038-static-cooling-fan-mount
Printables.com
V-Core 3 120x38mm Static Cooling fan mount od autora NecroDavid | S...
120x38mm static cooling fan duct for Rat Rig V-Core 3/3.1 | Stáhněte si zdarma 3D modely ve formátu STL
KaylebPrdelni
KaylebPrdelni•13mo ago
I'm trying now with https://discord.com/channels/582187371529764864/878965315596349490/1133613346818629714 as a test. starting at 200C, 60C bed. 30% fan on all the time, ramping up to 50% for overhangs, 5 second run-up, 0.2 sec kickstart. The rest is Orca defaults for RR500. Wish me luck.
KaylebPrdelni
KaylebPrdelni•13mo ago
Same thing.
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KaylebPrdelni
KaylebPrdelni•13mo ago
I'll increase the fan speed next. But I find it ridiculous. Compared to my i3 it blows million times more, prints the overhangs at even slower speed and this is the result 😔
beejayf
beejayf•13mo ago
Lower the temperature a lot just to make sure it is not that...
KaylebPrdelni
KaylebPrdelni•13mo ago
190 fan 50; 190 fan 70; 200 fan 80 😠 I can't believe I have to go full blast on PLA at these speeds. At full tilt, fine, but at 11mm/s on overhangs ?? Disappoinment barely describes.
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eastern-cyan
eastern-cyan•13mo ago
What speed you talking about? How fast plastic cools is not about speed, it is about layer time
KaylebPrdelni
KaylebPrdelni•13mo ago
11mm/s for overhangs. the rest is default.. in fact, here's the settings. You reckon this could help https://discord.com/channels/582187371529764864/951978948718366730/1027181257341276181 ?
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KaylebPrdelni
KaylebPrdelni•13mo ago
here's the speeds from slicer:
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KaylebPrdelni
KaylebPrdelni•13mo ago
what speeds are you printing at, if I may ask?
eastern-cyan
eastern-cyan•13mo ago
Have you tried different filament?
KaylebPrdelni
KaylebPrdelni•13mo ago
It might be filament in part I guess. I just tried printing at 80-100 fan for anything over 30deg . It looks decent then. I just find it ridiculous that I need such a volume of air for PLA. Sadly, with the results, I'm considering CPAP 😒 I'll try with different filament tomorrow. But don't have any other brand at hand, just different colors. Have some on order, so I guess I'll have to wait for concrete results a little longer. OK. filament brand makes no difference. Unless I go full blast on PLA overhangs they look horrid.
Animatrix
Animatrix•8mo ago
same issue did you get aroudn this ? i find it hard to believe that a 4028 is not able to cut it and yet i'm here
KaylebPrdelni
KaylebPrdelni•8mo ago
In the end I changed the original nozzle for the one with extra flow. Made all the difference. Now it's presentable. Still, have to admit, I was expecting little better. One more thing I changed. Clumsy hands killed the killer fan it came with, so I changed over to Arctic 4028. It's much quieter, so it can run at faster baseline speed without too much annoyance. Full blast speed is lower, but honestly, I think the original fan is a bit overkill at the top end. Oh. And one more thing. Ticking that Classic Mode box sometimes helps. Sometimes being the key part there..
Animatrix
Animatrix•8mo ago
i have a high flow nozzle already lmao i dont understand how a high flow nozzle would help with overhangs
KaylebPrdelni
KaylebPrdelni•8mo ago
Fan nozzle....
Animatrix
Animatrix•8mo ago
wait whats a fan nozzle you mean the duct ? are you using the tri horn duct now ?
KaylebPrdelni
KaylebPrdelni•8mo ago
There you go Words 😂
Animatrix
Animatrix•8mo ago
haha its aight trihorn duct right ?
KaylebPrdelni
KaylebPrdelni•8mo ago
Brainfart on my end. Sorry.
Animatrix
Animatrix•8mo ago
if not do link me to something
KaylebPrdelni
KaylebPrdelni•8mo ago
Correcto mundo. Tri horn is the thing that i believe did it for me. Through i did change the fan at the same time. But again, it's gone down in volume and speed, so that shouldn't be that...
Animatrix
Animatrix•8mo ago
one thing that i'm considering is fan "lag" sometimes your fan wont go to max as its demanded setting a global max might help test this theory
KaylebPrdelni
KaylebPrdelni•8mo ago
You can set spin up time in slicer, so it kicks off before it needs to
Animatrix
Animatrix•8mo ago
oh wow what's your spin time ?
KaylebPrdelni
KaylebPrdelni•8mo ago
3sec. Just to be on the safe side Measured just under 2...
Animatrix
Animatrix•8mo ago
just curious what's your hotend extruder combo and pressure advance value i used to use rapido + orbiter. now using v6 volcano (copper) cht + orbiter
KaylebPrdelni
KaylebPrdelni•8mo ago
Lemme check.. like i remember 🤣 Rapido and Lite Bondtech So, yeah, you're probably pushing little more than I do I have max set at 25mm³, then it starts skipping like mad with PLA at 230..
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