This is a remix of 'Sunflower' by falldeaf. I Modified it to make it easily printable without support. Of course you lose some of the quality of the original model but it is still a nice object. File 1 is the top layer, file 2 is the bottom layer and file 3 is the plug that connects the top and bottom layers.

I took extracted one petal and the heart from the original model and modified those to make the petal lay flat on the printbed. The top layer was stitched together and a hole was made in the back. There are bridges there but they are nicely out of sight. The the bottom layer was created from the same petal. Lastly a cylindrical plug was created to press fit or glue the two layers together.

The STL files are tiny! I printed these scaled up 50 times for a diameter of 100 mm. Printed in natural ABS. Size 100x100x11mm.