I ran into this on one of the models for the Voron’s Clockwork 2 (specifically, this one ).
The sliced preview shows the error, which printed… very dutifully as instructed. .
The print was easy enough to clean up, but now I have one of my own designs and the same thing is happening :(
Any ideas to fix it? My model was straight from Fusion 360 and appears manifold. I’m pretty sure the Voron components are also modeled in Fusion 360.
Edit / small update: it looks like the error is specific to SuperSlicer. I tried the same model in PrusaSlicer and didn’t have any issues.
Oh, and try using a different slicer. Cura, Prusa, Slic3r, whatever's popular nowadays.