jnrehder

Thank you GregValiant. I will reduce the print speed and try again. Regardless, I've found that the hair can be removed quite easily with boiling water.

I use the standard setting "Inside to Outside" for Wall order and the recommended speeds by Cura. 30mm/s for the outer wall and 60mm/s for the two inner walls and fill (I use three layer for the walls). Maybe I try the same speed for the two inner lines?

Thank you GregValiant. I checked the Combing Mode setting. It is "all on". I looked at the head movements in the simulation. Obviously my guess about the head going over the cavities was wrong. The movements seem to be OK in Cura. The hair still appears?! Can it be that the printer optimizes the movements and then makes the direct path through the cavity? Very strange. I've attached a picture of the "hair". This is very fine and dense hair that is difficult to remove.

I would like to slice an object with a cavity using Ultimaker-Cura-5.1.1. The printout works wonderfully with PLA (even without support structures), but I have big problems with TPU. It seems that the printhead is regularly dragged across this cavity, creating threads in the cavity and rendering the print unusable. Other forums recommend tweaking the print settings until these threads no longer appear. I tried the build in settings for TPU and also used the material parameters, recommended by the manufacturer - but this did not help much. I print with a Anycubic Viper. Question: Is there a setting in Cura that prevents the printhead from being dragged across cavities? UPDATE: It doesn't seem to be Cura's problem (or is it?). See my update below.