When I went to the Great American Scrapbook Convention in Arlington, Tx last month I picked up one of the new Mar-Kits for the Silhouette Cameo. This was by far the easiest marker holder that I've ever used. You just pop in the Sharpie micro marker in the holder & insert in the machine.
I tested it on the typewriter sketch from the Silhouette store. I noticed that the Silhouette holders are not listed for sale yet but this marker is definitely one to consider whenever it's available for the Cameo/Silhouette SD.