LXXXIII

From what I found in the Generic PLA material profile its 60°C

So I found this article: https://support.makerbot.com/s/article/1667412439151#:~:text=Cold pull,-1.&text=After the last hot pull,and apply pressure with pliers.&text=In the Set nozzle temperature,90 °C for PLA.&text=Continue to apply pressure as the nozzle is cooling down. It describes the procedure for a hot and cold pull. For a hot pull they say you need to heat up the nozzle to 235°C when using PLA for the hot pull. After the last hot pull they say you need to put the filament back in and apply pressure while lowering the temperature to 90°C. I'm going to attempt to change the 'break temperature' to 90°C and see what happens. If successful I can maybe try lowering the temperature by let's say 5°C increments and see what happens.

I think where on to something... I found one of your other posts that's very interesting: When I look at the Ultimaker PLA profiles I see this: <!-- Deprime settings --> <setting key="anti ooze retract position">-4</setting> <setting key="anti ooze retract speed">50</setting> <setting key="break preparation position">-16</setting> <setting key="break preparation speed">50</setting> <setting key="break preparation temperature">210</setting> <setting key="break position">-50</setting> <setting key="break speed">25</setting> <setting key="break temperature">60</setting> <setting key="pressure release dwell time">25</setting> <setting key="dwell time before break preparation move">4</setting> <setting key="end of print purge volume">0</setting> <setting key="end of filament purge volume">0</setting> <setting key="flush purge length">60</setting> If 60°C is too cold to retract the material from the print core at the end of a print, what temperature should it be? Is it as simple as changing the 'break temperature' in the material file, saving it and importing it to Cura?

Wow, I already had the feeling you know a lot about these machines. But this sir, this blows my mind. I understand what you're saying. It honestly makes a lot of sense. Even by just looking how the tip of the filament is formed when it comes out of the core after the jam. What I'm about to say maybe sounds a bit harsh, maybe even inappropriate. But one doesn't fork out the money for an Ultimaker S5 with Material Station to then have to start drilling out print cores just to make it do what it's supposed to do. I do have the skills to perform the 'surgery' to the print core that you're describing. But really? I run this printer to support my business. I understand thinkering is still a part of 3D printing. But the potential solution is on another level. If there's an issue with the teflon on the inside of the print core, that, to me, is an Ultimaker QC issue and shouldn't be mine. Further, how big is the chance that you buy 2 Ultimaker cores (1.5 years apart) and a 3DSolex one for good measure to discover that they all have the same issue. To put it blunt, if I felt the need to thinker with a 3D printer in my spare time, I wouldn't have bought this Ultimaker S5, I would have bought something way cheaper. But another observation. Maybe not the solution but perhaps another way of looking at the issue. When I monitor the print core temperature during the final minutes of a print, the print core is at 210°C. When the print is finished, the 'cradle' with the print cores moves forward and to the left, where it starts cooling down. At exactly 60°C the printer starts retracting the filament, this is the exact moment the whole thing jams and you're presented with the error screen. When you start the 'assist' program to free the material, the print core first starts heating up again. When it reaches a certain temperature it goes to the next step and asks you to remove the Bowden tube and pull out the material manually. My question is this: To what temperature is the print core heated in this recovery mode? It sure is more than 60°C. And why is this 'recovery' temperature not used in the first place? @gr5 I'm truly sorry for the rant above. It's defenately not aimed at you, on the contrary. I really appreciate your input and have huge respect for the knowledge you share with everyone here!

It's been almost one year since I originally posted this issue. The problem I addressed is, you guessed it, still a problem. - Still performing all necessary maintenance to the machine. - Always updated machine to the latest firmware. - Bought a 3DSolex Printcore Coreheating - Printcore AA .40 Tri-X + some additional 3DSolex Printcore AA-BB Nozzles - 0.60. This printcore almost drove me to insanity! No matter what I tried, I couldn't get it to work properly. Contacted 3D Solex through their contact form ... received no response. - Since almost everything and everyone was pointing at the printcore I also bought a new Ultimaker CC 0.6 printcore. This prints fine but still had the issue with the material being stuck after every print. Conclusion - It wasn't my first Ultimaker CC 0.6 printcore. This, combined with the 3DSolex printcore was a very expensive troubleshooting step! After one year of this miserie and observing the machine carefully each time a print ended I believe the issue is caused by the sequence the printer uses to end the print cycle. The printcore is cooled to much before the printer attempts to retract the material. Can anybody tell what the optimal printcore temperature is for PLA when the printer retracts the material? This is my last effort trying to resolve this issue. I've almost given up on this machine, and Ultimaker by extension.

It's a regular CC 0.6 core. Only printed PLA with it. I already came across the 3dsolex website in my troubleshooting search. I've now ordered an AA printcore from them with 0.6 nozzles. During regular maintenance I do a hot and cold pulls. The print core is always as clean as a whistle. Once the 37h print that's running is complete I will do some cold pulls on the 0.6 and a 0.4 nozzle. I will share my findings. The fan is in my case not the cause of the problem. Its working fine. The line width is absolutely set to 0.6. I'm printing a model that's designed with a 0.6 in mind.

I read in other posts about issues with the fan causing a similar issue. I already checked. The front fan is working properly and there is also no debris blocking air flow. I also suspect it's the print core that's causing the issue. What's the expected lifespan of a CC print core? I'm at 16 days right now. Doesn't seem that long. What's the alternative to a CC 0.6 print core if I want to continue printing at 0.6 nozzle size?

I've tried switching to Cura 5.2.1. But for some reason I can't get the same results with the particular model I'n currently printing compared with slicing in 4.13.1 I know the CC print core is not really designed for printing PLA. But what's the alternative if I want to print with a 0.6 nozzle? The S5 is on firmware 7.1.3

Hello, The past year I printed sporadically with my UMS5 (Pro Bundle) machine. All this time without any issues. In the last 3 weeks I ramped up printing to almost 24/7. Shortly after this I encountered more and more 'The material seems to be stuck in print core 1' errors after each print. At this point it's happening after each print. When completing the wizard and removing the stuck material I can't seem to notice why the material is stuck. The end of the material looks normal when I inspect the ejected material. At the area where the material was in the feeder I can see some grinding damage. I regularly perform maintenance on the machine, following the Ultimaker instructions. This includes cleaning the print cores (hot and cold). The machine runs the latest firmware and I'm using Cura 4.13.1. I'm using a CC 0.6 print core and am printing Fillamentum Extrafill PLA. (I tested with Ultimaker PLA, this also results in stuck material) Any input on how to solve this issue will be appreciated.