Issue printing small chair prototype

[lakerice]

Hi,

My first post here and I'm pretty new to 3D printing so hopefully my question is asked properly Basically, I tried to print a miniature version of a chair that is intended to print life-size and the guy in the print shop said that it won't print properly because there isn't enough support for it. Also, it is too thin for printing; the chair in life-size dimensions is supposed to be hollow aluminum with a thickness of 2mm. So when it was scaled down to about 2 inches width (should fit in the palm of one's hand) it was just way too thin to print. This was done in Fusion 360.

Essentially, I am just trying to print this chair while being hollow and with internal ribs.

Here is a screenshot of the chair: