Inconsistent printing..

[Harish 0]

hi experts,

this is the second time i am seeking help for the same problem almost.

broadly it seems like underextrusion but i have learnt its much more complex than this.

pls check the pictures attached

using ultimaker2+ , PLA filament,

The extrusion typically stops after a few minutes of printing,the timing & height at which it stops is varying. Everytime this happens, I literally have to go to settings and heat up nozzle to 230 or 260 and then do "move material" and even sometimes remove the bowden tube from the extruder head & manually push down the filament into the nozzle and only then the extrusion happens

I have changed the feeder assembly.

There is no clog in the nozzle.

Have changed the nozzle too.

Bed levelling and gcode file have no issues, as the same print prints fully well once and it doesnt later.

Have tried changing the 'Current z' setting from 1200 maH to 1100 maH , but its gotten worse.

I felt the filament spool was too heavy for the feeder to pull but i noticed that the spool with half the filament(half the weight also) is giving the same result.

wat could be wrong ??

pls help as i am losing valuable time and peace of mind

[neotko 1,417]

How many print hours has your machine?

The TFM white coupler has print time life of 500-2000h. When it reaches his end the tip goes brown making much harder for the filament to move in, and that could fit on '230-260C to be able to extrude'.

[Harish 0]

hi neotko , may have printed for abour 200 hours, but this issue has been there even when the printer was newly procurred. any other ideas ?

thanks for replying in..

[neotko 1,417]

Can you check if the bowden is fully in, inside the coupler, sometimes it hits the aluminum and feels like is in, but isn't.

How does the filament look when this happens? Does it show a bite?

Have you done some Atomic Pulls lately to purge the heat from any dust or materials residue?

https://ultimaker.com/en/resources/19510-how-to-apply-atomic-method

How does the head looks? Does the small fan behind the head moves as soon it reach 40-50C ?

[ultiarjan 1,220]

And you can check if there's not debris stuck in the inside of the feeder;

http://support.3dverkstan.se/article/64-disassembly-of-the-ultimaker-2-plus-feeder