  Ceramics containing open channels with complex geometries can be manufactured
by additive manufacturing (AM) and are of great interest in clean energy
technologies. However, design limitations and guidelines for manufacturing
these architectures with AM have not yet been established. In this work, we
compare previously proposed geometry limitations for polymer selective laser
sintering (SLS) to the geometries produced using indirect SLS in alumina. We
focus on a subset of model shapes that are simple to produce and measure. We
show that these rules provide a starting point for the design and manufacture
of ceramic geometries using indirect SLS. However, there are additional
considerations for AM of ceramics by indirect SLS that further limit the
geometries that can be produced.
