I need some help figuring out these errors in my slice. If there is a better sub to post this to, please let me know. Thanks in advance.

I'm trying to print this "pin" I modeled in Fusion 360 (based off a photo)

​

preview of final layer in Cura

But Cura wants to print these funny lines in what should be the first layer of the "top" (maybe?)

​

preview of top layer

Some of these lines would be "floating in space"

​

preview layer animation

These lines are part of the "key shape" in the model, but in Fusion I made sure to join all the extrusions/features so the piece is only 1 body.

​

fusion model

Section analysis shows there aren't any lines or voids or anything through that part of the body

​

cross section at \"key\" shape

I have a good bit of experience doing 3D modeling/CAD in Fusion, but I'm fairly new to 3D printing. I'm happy to share files or answer any clarifying questions if anyone has any advice. Here are a few more pictures for some context, if needed.

​

some print settings in Cura

​

\"export as mesh\" in fusion

I can't figure out what I'm doing wrong.

EDIT: A few details: Modeled in Fusion 360, Slicing in Cura 4.12, (trying to print) using PLA on Ender 5 Plus.