The Ultimaker 3 series printers can print with two materials at once. However, not all materials will bond well to one another. Before beginning a print with a new material combination, please check that it is supported. Some materials are incompatible with one another and will not bond well; these are marked with an X on the chart below. Supported material combinations are are marked with a check mark. Experimental combinations are use at your own risk and may not or may have poor results. For more details, see here.