Like the Cameo 3, Curio features a dual carriage. The dual carriage means that you can perform two functions in one cut job, such as a score and emboss or a multicolored sketch. The first carrier is denoted by a red circle, and the second carrier is denoted by a blue circle. The Curio knows to do the action associated with the red circle first and the blue circle second. You can toggle between tools by clicking “Tool 1” and “Tool 2” in the Send panel.
A Silhouette Sketch Pen will fit perfectly within that carriage. However, if you are wanting to use a non-Silhouette tool, the pen holder is a great tool.