Printing a torus fails on bottom side

Bambu Lab X1 Series Troubleshooting
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1

Hello,

just for testing, I created a simple torus in Blender, exported it as a .stl-file, imported it in Bambu-Studio and printed it. The torus is fine on the top side and the sides, but the bottom side doesn’t look good:

torus
torus600×800 132 KB

I get some “secants” and the surface seems to be broken.

I’m using a x1-carbon with a Bambu cool plate + glue stick and the Bambu PLA-filament shipped with the printer. I’m not using support-filament so far.

How can I get a better result?

2

I have had this exact problem too but thought nothing of it because it didn’t really matter for my part.
But now it seems like some sort of recurring error