Why is this not printing the middle part?

Check out this design.

https://drive.google.com/drive/folders/15IHgFCvopLow2eZ_dTVhpeczqNu6KmDZ?usp=share_link

It looks ok to me, but when I print it to my Bambu printer I dont get the pattern body, just the rectangular plate and frame. Can you tell what’s wrong?

The slicer ignores the pattern as is smaller than the width of a .4mm nozzle.

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Increase scale by ~33% for those details to be well printable on a 0.4mm nozzle.

Or reduce by ~25% and use a 0.2mm nozzle