Filament extrusion always stops at some point during print I own a Creality CR-10 (using Ultimaker Cura for slicing) and I am experiencing terrible printing problems.

My problem:  I am not able to print anything that takes several hours to print. For parts printed in 30 minutes or so, my printer usually works.

The prints end up like this (unfinished and with a lot of stringing)



This below is actually the best result I got so far.. (important note: there is no under extrusion during the print, it suddenly stops out of nowhere..)

(Although I have to use terrible retraction settings and need a lot of post processing because of all the stringing - you might have an answer for that too.. I just couldnt get the 3d printer to print parts properly with good retraction settings.)

The problem is that at some point of the print, no more (PLA) material is extruded and the printer moves without actually printing anything. The first couple of layers usually work (you can see that in the images) but after wasting almost 600 grams of PLA, I am not able to find a solution myself.

.

I have some suspicions:

Could the problem be the angle, the PLA is inserted into the feeder? (so that it is almost a 90 degree bend)? The filament comes from a spool in the right hand side. But I dont think that this would cause such a problem..



Is it a software problem? Here are all my cura settings (I even reduced the printing speed to 30mm/s at 205°C - still didnt work..)     :-(





Could the length of the bowden tube and it tangling up be a problem? (as you can see in the image below)


And annother important thing: The feeder always grinds into the filament (even at those low retraction settings) and it is always very hard to pull the filament out of the bowden after a failed print. Sometimes its almost impossible and i have to use heavy tools for it.. that should be the probelem


I already did some atomic pulls, replaced the nozzle and switched the bowden tube.

I have a dream: My printer printing a part without any stringing and actually finishing the print. Please help me to achieve this dream..

Thank you for your help in advance. :)

(and the filament I used, sorry for the bad quality of the pic)
Stringing?

The stringing is explained by your relatively low retraction settings, 1.5&nbsp;mm is not much for a Bowden setup. As do too high printing temperatures.

Stopping mid printing?

What you are experiencing is called clogging, the extruder cannot push the filament through the hotend and cause the grinding you report. Clogging mid printing is usually caused by insufficient cooling (for the temperature you print at) of the cold end (causing heat creep; slowly increasing temperature of the heat break), especially all-metal hotend assemblies are notoriously known for this problem. 

Your Bowden tube does make a lot of kinks, maybe you can improve the path of the Bowden tube. Also if you are concerned about the sharp filament intake angle, you could print a filament guide: