Texture Map size for Full Color Sandstone?

Is there an optimum size for textures to use with full color Sandstone?

I had a print done last month and I used a 24bit 1000x1000 image. The results were good but would a higher resolution be better or (as I suspect) does the printer resize the image before using it?

If the printer does resize the image I'd like to know the resolution so I supply it in the correct size myself.

Thanks!

... nothing from Shapeways?

Is my question not clear?

https://www.shapeways.com/tutorials/exporting_to_vrml_and_x3d _for_color_printing

Amazing! Finally. Thanks!

"we recommend you keep the total resolution of your texture maps below 2048x2048 pixels."