Question about slicer nozzle travel decisions.

[FirecatUK]

Hi,

I would like to start by saying that I am new to 3D printing and have been experimenting for the last couple of months with plenty of failures and successes to show so far.

However, there is one STL file that has been my nemesis - no matter what I do it just doesn't print well. I can print another object perfectly and then reattempt this file only for the print to die in less than an hour. This is it:



This is how it usually looks while printing:



Occasionally a bit better



I know that the stringing issues here need work (an endless battle it seems), I'm trying to improve this with retraction settings (limited success so far). However, I can print many things really well that don't have large voids so I would like to ask

why is the nozzle is traveled across the interior of the print at all.

Doesn't it make sense for the print to just go around in circles due to the tubular design? I tried using the "Avoid crossing outline setting" after reading some of the help documents here, but it still does this:



Eventually the print fails - normally after 6-8 hours (roughly 50%) due to over extrusion & filament break. I believe that this nozzle travel behavior is contributing to the clog that causes this over time as I have other successful prints that run longer.

Some additional info:
Ender 5 Pro
Latest TH3D and BLTouch equipt.
Printing with PLA. Temperatures of 190, 200 & 210 all attempted - tower of shame below
Retraction settings are a massive work in progress.
STL file available here https://www.sonosax.ch/wp-content/uploa ... G_ACC.zip/



Any advice gratefully received - thanks.

[gwarokk]

I really don't think it's travel moves causing your problem. More likely retraction, speed, possibly poor filament, maybe even extrusion issues like a gap between the ptfe and nozzle that forms a molten filament blockage inside your hotend that can impede retractions. This is common thing in creality printers. This video https://www.youtube.com/watch?v=uKN0VOu ... e=emb_logo explains the issue very well. Might want to list your settings also.

[FirecatUK]

Thanks for the response and sharing the video - its a really good explanation.

However, I'm still very curious as to why the nozzle is traveled in this manner.

[gwarokk]

Do you have "avoid crossing outlines for travel movements" turned on under advanced? If not, Try turning it on and using a value of at least 10. Also, have you tried it in a different orientation, maybe?