Printing white and metallic on black Vinyl.
When printing white and metallic on black vinyl there are a few things to keep in mind to make sure the color comes out saturated and opaque. The ink on the Roland Versaworks is naturally translucent so when printing on a dark color you have to account for this by printing in layers.
The order is White then metallic color.
To set this up in your illustrator file make your shape and fill it in with the white swatch. To find this swatch go to the additional options in the swatch palette, look for saved swatches and click on the "Roland Versaworks" palette. The white swatch is the second one, and you can confirm this by hovering over it and seeing the name. Now that you have this shape filled in an easy way to duplicate it is by selecting it, copying it by hitting command+c, and doing a paste-front by hitting command+f. This will copy the shape and place it directly on top of the previous shape. This top layer can either have a metallic fill or standard color fill.
Once your artwork is set up save it out as an .eps and drag it into the Roland Versaworks application to print.
Once the file is loaded go to the settings. Once in the settings you'll set up as normal identifying the media size, centering (if you want). The difference is selecting a media type when your in the 'Quality' Tab. With black vinyl typically you would want to select (MT) Glossy Calendered Vinyl, but when printing white you have to select (MT) Clear Calendered Vinyl. The reason for this is because clear vinyl by default needs a white base whenever printing other colors on it. Once you've selected (MT) Clear Calendered Vinyl, the 'Mode' option will be available to toggle. Click on the drop down and select White -> CMYKMt (v).
Once this mode is set continue to set up the rest of the job as normal and if you're printing metallic don't forget to go to the 'File Format' tab and select 'convert spot color'.