this post was submitted on 19 Mar 2025
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44
Is this just crappy Filament (lemmy.world)
submitted 1 week ago* (last edited 14 hours ago) by [email protected] to c/[email protected]
32 comments fedilink hide all child comments
 

Im working with an old reprap cotroled directly with an Laptop with cura. Filament is RS-Pro (2325395) Pla though. Open around 4 weeks ago but i have this problem in some capacity since i have this Filament. Before i had some really old pla which snapped all the time because it wss so brittle. Is this really just shitty Filament? Help/ Insight would be much appreciated.

Edit: solved. Disabling the retraction worked (as a temporary fix). The Spring of my extruder is too strong so my extruder was eating my filament especially in high retraction areas. The results with my old and hard filament were better because it was so hard the extruder didn't eat it. Picture is in the comments. Thanks everyone for your help.

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[–] [email protected] 1 points 14 hours ago

Result after disabling retraction. (And changing nozzles from 0.8 to 0.4)

[–] [email protected] 23 points 1 week ago* (last edited 1 week ago) (2 children)

old pla which snapped all the time because it wss so brittle

That's what extremely wet PLA looks like.

[–] [email protected] 1 points 1 day ago

Yeah thats why i bought new Filament but my point was i never had the underextrusiom with the old one just with the new one Turns out my Extruder sprimg was to hard so my extruder gear ate my Filament. The old Filament was so hard this wasnt an issue

But thanks :)

[–] [email protected] 3 points 1 week ago (1 children)

depending on the situation, you can pull humidity back out of it and reuse it using a bunch of silica dessicant.

[–] [email protected] 7 points 1 week ago (2 children)

Or just toss it in the oven at a low temp for an hour or so. I've also turn my bed temp up high and put a spool on it with a box over it. Just cut some small holes in the too to allow humid air to come out. After an hour or so should be good to go. Assuming the issue is moist filament.

[–] [email protected] 6 points 1 week ago (1 children)

I never succeeded in drying filament with the normal cheap ways people post around.

But I've had plenty of luck with a filament drier. Those aren't too expensive.

[–] [email protected] 2 points 1 week ago (1 children)

I want a filament dryer, but I'm too cheap, and don't use my printer enough. :(

I want to start using it again, but I've been struggling to get the motivation to recalibrate and figure out all the optimal settings again.

[–] Ajen 3 points 1 week ago* (last edited 1 week ago)

A dryer costs about as much as 2 rolls of cheap filament, and if you don't print very often then you'll probably waste more than 2 rolls to failed prints. A dry box with desiccant can also work, but it doesn't remove moisture efficiently - it just keeps things dry, so it won't recover your wet filament.

On the other hand, if the trick with the heated print bed is working for you, that's probably good enough. A cheap kitchen scale will tell you if it's removing moisture.

[–] [email protected] 2 points 1 week ago (1 children)

I misread this as you have a heater in your bed (the one you sleep in) and you dry your filament in bed.

[–] [email protected] 10 points 1 week ago (2 children)

Has the printer been used recently and put out good prints? Has anything about the setup changed including a slicer update or different slicer?

I have two knee jerk reactions

Is there an under-extruded section of the print, similar to the corner closest to the camera on the lower section of the print, on the top section of the print? You might have a retraction/priming problem. A quick retraction test print would make this pretty obvious.

You might have had a partial clog that resolved itself, but the fact that the extrusion issues change with the topology of the design makes me want to suggest something else. Try the print again. If you get the same outcome filament isn't the primary cause.

[–] [email protected] 4 points 1 week ago

I second partial clog

[–] [email protected] 2 points 1 week ago (1 children)

Yes the print immediately before was good (see my other commend) 2. Try same settings (left) seems a little bit better but still not good

[–] [email protected] 4 points 1 week ago (2 children)

I would strongly suspect a retraction/priming or mechanical related issue give byhe fact that it's repeatable in the same area of the print.

[–] [email protected] 2 points 1 day ago (1 children)

You were right thanks :)

[–] [email protected] 2 points 1 day ago

No problem! I'm glad you were able to get to the bottom of it.

[–] [email protected] 3 points 1 week ago

I think you're right

[–] [email protected] 10 points 1 week ago (2 children)

I've had partial clogs that manifest like that.
Cold pulls (several) ended up resolving my issue.

my best explanation was, that there was some debris in the nozzle, which would sometimes (nearly) seal the nozzle, and at other times be retracted with the filament, get stuck somewhere else and filament flows freely.

[–] [email protected] 1 points 1 day ago

I exchange the nozzle for a new one but no luck Disabling retraction worked. But thanks for your suggestion :)

[–] [email protected] 5 points 1 week ago

Yeah, I don't use much PLA but this looks like a partial clog, you can see that where you have long stretches of extrusion it works fine, but when it starts retracting it clogs.

It could very well be that it's clogging BECAUSE it's shitty or wet filament, tho. Is your nozzle screwed in correctly, heatbreak too, etc?

[–] [email protected] 8 points 1 week ago

Looks like wet filament to me. Those pock marks are what happens when the moisture immediately evaporates to steam and bursts when it hits the nozzle.

[–] [email protected] 5 points 1 week ago (1 children)

Print i did immediately before. Main differences no supports and less Variationen in horizontal Crosssection ?

[–] [email protected] 7 points 1 week ago (1 children)

Definitely looks like you have some extrusion issues here. Check if the nozzle is partially clogged and that the extruder isn't skipping.

[–] [email protected] 1 points 1 week ago

Exruder skipping would fit because I feel like it's happening more if the layer is multiple small sections (like between the holes in the original picture) But because I thought I have nice tooth marks there should be no skipping, but many its to much pressure. https://files.catbox.moe/1xgz70.jpg

[–] huskypenguin 4 points 1 week ago

It's your filament wet? Have you replaced the nozzle? What's weird is the edges appear to look like oozing but you've done a temp towers.

[–] [email protected] 3 points 1 week ago

I'd wonder about the model or slicer. You had great printing above and below that. Unless you had a nozzle problem that cleared itself up, that's a weird way to go bad right at that transition, and it's very symetric on that section.

[–] [email protected] 2 points 1 week ago (3 children)

have you done a temp tower with it? maybe it doesn't like your temp settings.

I've used old filament plenty of times and usually it just gets stringy

i think yours is a timing or temp problem

[–] [email protected] 2 points 1 week ago (2 children)

I've tried multiple temp towers but they all failed because of the underextrution. So I tried benchys with with 190 and 220°C and have seen little difference. Then I just stuck to 200°C for no other reasons then I've used it before

[–] [email protected] 2 points 1 week ago

if it only happens with that filament, its probably just that.

you could try some of the drying methods but that doesn't look good at all

if you're sure the filament is good then you want to look at the print settings and physical tensions on the belts and gears. maybe you need to look at the spot where your printer is located. can it add any wobble? one trick in the prusa community is putting your printer on a heavy flat yard paver stone and a thin foam under the paver

[–] [email protected] 2 points 1 week ago

Pretty bad underextrusion. Is the filament drive slipping?

[–] PiJiNWiNg 2 points 1 week ago* (last edited 1 week ago) (1 children)

When I had a similar issue to this I resolved it by adjusting my retraction settings, specifically retraction distance and speed. I think that may be the case here, as the layers most dramatically affected appear to be those with the most retractions taking place. Depending on the material and the style of printer you have (direct drive or Bowden) your settings will be different, but I would start by dropping the retraction distance and see how that changes things.

[–] [email protected] 2 points 1 day ago (1 children)

Thanks that was it :)

[–] PiJiNWiNg 2 points 1 day ago

Nice! Glad you got it sorted, happy printing!