Line when Printing Circle

[arktape 2]

I have a UM-S5 Pro. I am trying to print cylinders and have had a line going up the print every time. As the print head is going around I see it hit this glob and "jump" from the impact. I am not sure what settings to change to get rid of the line. Any tips would be appreciated. ABS with 0.4 nozzle, 1.2 mm wall thickness, standard Cura settings, haven't changed anything except type of infill. 

[kroete 1]

I have exactly the same problem, a line on the front side of the cylinder shaped print. Subscribing to this topic as I hope someone can share a Solution to fix / improve that. 

Edited January 27, 2021 by kroete

[Smithy 1,144]

This line is the Z-seam where the printer starts the next layer. It is hard to remove the seam completely, but you can try to enable coasting in Cura. With coasting the printers stops extruding a bit before the end of the layer and prints the rest of the line with the remaining pressure in the nozzle.  But coasting will not work out of the box by just enabling it, there are some settings to fine tune it. 

 

Personally I remove the Z-seam in post processing and sand it off.

 

Additionally to coasting you can also try to print cooler and slower and/or equalize all the print speeds to the same value. You can also try to use the engineering or visual profile in Cura.