I don't have ZBrush in front of me at the moment so I'll try and answer that for you... When using the plug-in 3D print Exporter there is a button for "Advanced" options. Click it and a whole bunch of other buttons unroll below. There is one titled "Colors". Click on it to turn it off...
Having said that whenever I've had this problem I'm pretty sure that didn't solve it. Maybe I never tried that. I've always had to load the ZBrush texture file into a painting programme and flip it (left to right) before putting it into the ZIP file.
Oh, and another thing, the JPG that ZBrush exported (in newer versions) saves the files as JPEG which doesn't seem to be recognised by Shapeways, so I always export it now as a PNG.
Let me know how you get on.
Glenn
Last edited: Apr 15, 2013