Exporting STL / OBJ file with texture and colours

[z1]

Hello! 

I'm trying to export my object as an STL and an OBJ file but when I export it, my object is white and has none of the colours even though "Materials" is on in the Export Selection options tab. Is there any way to export my selection as an STL or OBJ file with my Arnold colours? 

I am using Maya 2022.

I want an STL so I can do 3D printing. 

Thanks in advance for your help!