A 3D-printed acoustic spanner Ermes Toninelli, Mitchell A. Cox, Graham M. Gibson, Stuart D. Brown, Matthew P. Edgar, Andrew Forbes, Miles J. Padgett http://dx.doi.org/10.5525/gla.researchdata.628 Detailed instructions of the contents of this archive are inside the individual compressed files. An updated version of this supplementary material is available on GitHub at the following address: https://github.com/witseie/AcousticSpanner