  Additive manufacturing (AM; 3D printing) has clear benefits in the production
of lightweight mirrors for astronomy: it can create optimised lightweight
structures and combine multiple components into one. New capabilities in AM
ceramics, silicon carbide infiltrated with silicon and fused silica, offer the
possibility to combine the design benefits of AM with a material suitable for
visible, ultraviolet and X-ray applications. This paper will introduce the
printing methods and post-processing steps to convert AM ceramic samples into
reflective mirrors. Surface roughness measurements after abrasive polishing of
the AM ceramics will be presented.
