This wall-mounted 2D painting with an open top-floor design. These designs are suitable for printing on all printers.

Explanation about the open top-floor design: These screenshots are from another model, but the steps are the same, except that some parameters have changed.

All settings have been properly configured in the 3MF file; just open the file, select the correct printer and slicer, and don't overwrite the settings.

In the global tab, select the eight-pointed star spiral fill and enable support. Go to the object tab;

I used the Height Range Modifier