Hello, I'm working with a UM3 and trying to print with two colors of PLA. This works, but I keep getting strings. I watched the video to solve this, experimented with the retraction settings, z-hop, print speed, temperatures etc. I looked in this forum. But it simply doesn't get better.
One thing I notice is that it seems head 1 doesn't retract at all. I don't hear it pulling back the filament. When it switches to the second head, it always retracts correctly, doesn't have any strings. But to be fair, the first 95% is done by head 1, so it continually moves over already printed material.
Load/unload works fine on head 1. So my guess is it's not broken, but not sure.
Anybody an idea what else I can try or check? Any help is appreciated
Note: STL's are from Solidworks 2020.
Note: The attached photo is taken with the Cura default settings.