ArcWelderLib VS ArcWelderPlugin

definitely arc welder, but you have to have g1 g2 enabled on your firmware. read this command here here and you can download the console app to run it on your exported gcode on arcwelders github

For other slicers, you will need to use a script like ArcWelder (Cura Plugin) (Script for other slicers)

Look into Arc Welder for further explanation and as a potential solution (though it is not perfect and can have its own downsides). The OctoPrint plugin is no longer maintained afaik, but there is a Cura plugin and other slicer post-processing methods.

You could also post process your sliced model through ArcWelder and get perfect arc curves for your print. It will go through the G-codes, detect curves, and change them to G2/G3 arc codes removing the edges completely.

if you're feeling really adventurous you could manually apply arcwelder using CLI https://github.com/FormerLurker/ArcWelderLib

Looking through the Issues in the GitHub Project seems like there is currently a "flow" issue that is still open as you can see here

Arc Welder may not be properly handling variable-width extrusion lines yet. See https://github.com/FormerLurker/ArcWelderPlugin/issues/232.

Here: https://github.com/FormerLurker/ArcWelderPlugin