It's slicing fine for me. I'm using Cura 5.0.0.
I get the same thing - that light line. It looks like it's below the print bed but it is not.
I know because your part is symmetrical and you can see that it is printing symmetrically: the top and bottom rings are the same thickness/height:
Also it's not *below* the bed - I know this because you can see below, the teal colored ring. That's on the bottom layer for sure. That's the skirt. And on that same bottom layer it is printing your part.
Maybe there is some bug in your version of Cura. You probably already said but what version of Cura are you using? Could it be that you *had* the bug in the past but now it is slicing fine? Because your screen shots from Cura look perfect. Maybe you had a problem but you fixed it but you are afraid to test? Or maybe you have some buggy version of Cura? I can't run anything newer than Cura 5.0.0. I get some error about libraries or something.
@chris413 The image below is that first project file. You can see it's sitting on the bed. I get the same thing with the little ring you posted.
We're beating this to death and not making any progress. Try installing a Creality Ender 3 and change the bed size to 250 x 250 x 250. Slice with the Ender active. If the problem is till present then that would eliminate the LotMaxx definition file and platform as the culprit.
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