STL not slicing properly?

I have a STL file that is the base for a ninja turtle, so it has two squares that line up to the turtles feet and help it stand.
I have all 4 turtles, 3 of the bases turned out fine

this one base/stl file isn’t slicing properly. It doesn’t complete the entire first layer on the build plate, it completes about 75% of the first layer, then moves to the second layer and tried to print in empty space that should have a first layer.

I noticed this from watching the print while it failed, it failed 3 times in the same spot.

I have supports on, so if there was an air gap I would expect supports to kick in.

in this image, you can see the color change, that is where the issue happens, the lighter area doesn’t have a 1st layer

Any ideas how I can fix this file?

Can you move the model downwards by 0.1 to 0.2mm to see how it changes the first layer tool path in the preview?

Heading over to the Move field looks like this

I don’t move objects in BS often so I don’t know if that z value is odd.

Should I change the z value to be 12.31 or so and try to print?

Eno is sayin that the stl you are using’s bottom is likely not perfectly flat but very close. If you cut off the bottom a tiny bit, you can “cut away” the part that isnt flat and now you have a flat bottom. In the slicer, stuff “under the plate” is implicitly cut at the plate line. You can use the cut tool too, if you prefer.

If the model is perfectly flat, then you might need to play with the rotate tool and/or the “lay on face” tool to ensure that it is also oriented perfectly flat.

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Got it, that makes sense. I’ve never had a model behave this way. If I double-click the stl and let it load in bambu studio and just slice and go from there I have an issue. Here is the first layer by just letting BS place the stl on it’s own.

I moved the slider down to the first layer, you can see its missing a portion (the darker grey portion).

Moving the model down fixes the issue, thank you guys for that.

Also, just select lay on face and selecting the bottom of the model fixes the issue.

You can see the area you can select, seems like the bottom of the model is okay.

then selecting slice and looking at the first layer, the layer looks good.

Seems like the issue only occurs when I let BS handle placing the object on its own.

Thanks again for the help.