Recently, I figure out a way to directly make the 3D tree model (with 72 leaves or hearts) by 3D printing technolgy. I upload a few images and gif for your information.
design image (front and back view)
![enter image description here](https://community.wolfram.com//c/portal/getImageAttachment?filename=dd.jpg&userId=569571)
prototype image (front and back view)
![enter image description here](https://community.wolfram.com//c/portal/getImageAttachment?filename=391233.png&userId=569571)
Gif for different viewpoints
![enter image description here](https://community.wolfram.com//c/portal/getImageAttachment?filename=small.gif&userId=569571)
![enter image description here](https://community.wolfram.com//c/portal/getImageAttachment?filename=3.jpg&userId=569571)