I've had this happen to me, with a black roll of inexpensive pla, does it as i am sitting at my desk and randomly ill hear it break.

I experience this from the filament being too dry. Try leaving it in a dry box for any period of time and the same will happen. Doesn’t matter if it’s the cheap or better, or pla+ (pro or whatever).

I still think it would be worth trying to dry the filament and see what happens. I have noticed the same thing with a roll of hatchbox. It seems to get worse with the filament age and definitely the bend radius on the spool (less full spool is more brittle).

Thanks for this, I couldn't understand why my filament kept breaking at the start of a new day's print. I would leave the filament inside the feeding tube overnight where it was of course being held straight. This is a black filament which seems a heck of a lot more brittle than the last filament I used, which was white and didn't snap once. Weird!

I opened a brand new sealed sunlu black pla and was breaking like spaghettis. Some part are solid and 1 meter later unusable. I think it's more a factoty problem with mix or something

I have never had a problem until yesterday. I got an out of filament error and I went to check and the entire roll was loosely spooled and then I noticed way to many ends. It had just spontaneous fractured into hundreds of pieces.

I had this happen. I am on about my fourth or fifth roll of filament - now, they keep breaking, and clogging. It is incredibly frustrating.

hi, I encountered such filament breaking today, I still cannot find the right answer, it keep breaking easily and I cannot load the filament properly. I think is much related to the quality of the filament. I opened an enclosed filament which I left for 1-2 years, even it is silked, it breaks easily, so I think is oxidized .

I have the same problem and thought it was from over-drying the filament. Any thoughts?

Yea i have same problem the part exposed before the extruder it snaps over night but doesnt snap while printing

I'm dealing with this right now. I rolled up and stored a spool of Hatchbox and a did the same with a roll of much cheaper PLA, was a box of multiple colors in smaller spools. I also still had a loose roll of the original white PLA that came with my printer. The included white PLA survived the year of laying out just fine, same with the hatchbox. But the cheap small spool stuff became extremely brittle but only in certain spots and started breaking up mid print between the spool it was feeding from and the tube where it was getting fed into for printing. Based on my experience here, cheap PLA is more of a problem than how it's stored.

The fan exhaust might be drying the filament out causing the PLA filament to break. I have the same problem with my PLA. I can load and then print a model. As soon as the model is finished printing, the filament snaps at the feeding gears on the back of the printer. I have never had any problems with PLA Tough breaking though.

EXACTLY what happened to me!!!! I have an AMS lite unit, and the filament in the end of the spool is very "spring-shaped" . So leaving the filament overnight straight inside the ptfe tube made it very brittle!

Thanks 🙂 Going to pull it out of the bowden tube right now

Good video... I experienced this as well. Learned something. Thnx

Just doesn’t make sense. Got a roll of 3D solutech and same thing happens after it sets a couple hours the filament snaps and clogs up the hotend. Never had this issue before. It’s a nightmare having to completely disassemble the hotend to knock clog out.

For me, this is very repeatable with all pla filament. For me, it gets brittle between the spool and the extruder. In my setup, the filament takes a pretty sharp bend just before the extruder, and if I leave it for a couple of days it breaks all on its own. If I pull some slack at the end of a print and relieve the tension between the spool and the extruder, it gets less brittle. I think it is how you say: the pla is extruded hot onto the reel and completes final cooling on the reel in a coil. Unspooling the filament cold - flexing the cold filament - seems to initiate embrittlement. This same effect is probably acting on printed pla objects that flex. My "ear savers" flex around my head, and they tend to break pretty quickly, too.

If its brittle and you want to use/mount it, toss the roll into the oven at 50°C for ~30-60min.. then the roll wont snap and you can mount it and use it. And when no in use, place it in a sealed container with moist absorption material. :)

i've heard a food dehydrator refurbishes brittle pla, but havent tried.

Same thing happened to me and i found this video. Completely agree with you. Thanks.

i deal with this constantly. i use alot of the sunlu refills an if a roll last more than a week on a printer thats not inside a enclosure or at least the filament its self isnt, what is in open air from the spool to the run of ptfe is always brittle an i had always figured it was down to moisture. what i dont understand is if its in my enclosure it doesnt happen no matter how long its left and i think its down to the fact theres always at least one or two printers running inside a enclosure (i have a single large enclosure that hold 6 printers 2 enclosures total) so the temp inside is always 30c and above while on the ones in a enclosure by its self or with the filament out side the temps are 21-26c an that is when it happens. i found a roll that has been sitting for over 6months at least an there was quite a bit of the roll that was brittle but as the filament that had been covered come to the top it was fine so its only the filament that is in direct contact with air anything below the outer wrap doesnt seem to be effected. its a pain tho on a couple printers they have pretty long runs for the bowden tubes cause there delta printers so everytime it happens i have to pull a piece thats around a meter to 1.5 at least every time an it happens every single time the printer is left idle for more than an hour or so. so ive found a very small space heater that ive been keeping pointed at the two most problematic printers the past 2 days an so far so good but i have one of them pulled apart right now fixing a clog in the heatbreak was just taking a break an was looking at dehydrators cause i felt like that might helps with this situation.

It is 100% not moisture. I made the mistake of re-spooling a couple of my PLA spools and EVERY re-spool started to randomly snap and break. All stacked in sealed bags with desicant. I have this problem with both PLA+ and cheap PLA

You can get some bags from ikea 4.5L or 6L they are good to keep the filament spool inside

My print never finished because the pla keep broken in the middle of the print

is there any other solution?

I have a complete roll breaking like that. What's the possible solution?

I have been struggling for more than a year , and i think this might be my problem. I never had any problems with the printer until i changed filament . The nozzle seems fine, but the pla is super brittle. i am in a wheelchair , only use printer infrequently and when I need to re load the filament ...it can take weeks before I can get someone to help me. Does anyone know of a pla that doesn't have this problem ? I really want to be able to use my printer again but i can't be unloading and reloading filament everytime.

Is it because inside bowden tube some sort of chemical reaction between the ptfe and the plastic making it brittle

I actually will try this method. Thank you.

I both a matte pla filament and it started breaking right when I wanted to insert it the printer

my new problem, brand new pla, straighten overnight then snap. my on direct drive extruder. my solution is pull out the filament from extruder when not used, leave recoil back to spool.

Hey, today i was printing an iron man helmet piece that took over 14 hours, when i came home though it seemed to be that the filament snapped, but I literally just opened the filament. Do you know why it did that? btw i was printing on an ender 3

pla breaks from getting old and the humidity of certain areas ..i live in sw florida and i have only a few days until my pla becomes brittle as hell in summer and snaps like that and worse... yes its the cheap basic pla...but moisture causes it... dozens of pla rolls have done this... lucky i only have a few feet left on a roll... i am trying to prevent and also dry ...so far no luck..

My pla filegment was breaking how can i reuse please reply my question

what about putting it in when it new and put it in but it snaps and fails a print ? i just tryed to do a model tank but it was 5 hours and it only done the flat bit so did not print anything at all i think may been it snaped as saw it trying to feed but it could not ? also what should the room temperature be where the printer is ?

All my printers are direct drive. My humidity lvl is controlled at exactly 50%. I don't bother to store my PLA properly and I have some really old spools, 5 years or even more. Never had a filament break while printing, but it is true the if I leave the filament in the extruder for a couple of weeks I sometimes find it broken. It only happens with the cheap ones, never with hatchbox or similar. And it is just the few inches closest to the extruder, the rest of the spool is just fine. I have no idea why this happens. My only explanation is that the light (UV) affects the PLA. It is always the part that is exposed to the light. The shelves where my spools are resting are far from the windows, but the printers are in a large table next to the windows, although the blinds are usually closed, anyway... the spool is just fine, it is just the exposed filament left in the printer that snaps. That is my experience.

The problem is it can break while its printing . The Quesion is can it be softened .

This was happening to me on almost every cold start after a few weeks. I put on a capricorn bowden tube and it stopped completely. My guess is it has something to do with the teeth on the coupler cutting into the tube too much over time and scoring the tube, causing it to bend or letting air into that spot.

My prints keep breaking if there long prints any advice

just confirmed, it is due to filament expired, as I tested with a new filament, when I try to bend it, it is not broken but elastic. The entire expired filament can be thrown now, normally PLA last one year.

for me the filament keeps breaking at the extruder 2h 43 minutes into the print, every. single. time. without failure, i don't get why it does that.

This problem becomes worse the near the end of the spool it gets because the natural curvature of the filament increases!

Funny that every resource I have looked at states cheap quality. Yet, the cheap chinese filament I normally buy is flawless and the only named brand I bought is having this issue. I have had filament sitting for 2 years in my print enclosure, and the named brand is constantly snapping, yet the cheap chinese filament I load up is flawlessly working and no snapping.

What is the solution😢

It's moisture 100%. Put it in a dehydrator overnight and the problem will be solved

Bruh it snaps every 20 mins help

Bro rly rabbles for 5mins then just said take it out if the Bowden tube

Useless.