Kentstrapper Mille Prints Class A Acoustic Panel for School and Office Retrofits

Italian printer manufacturer Kentstrapper has 3D printed an acoustic panel that achieved Class A sound absorption in standardized testing. The manufacturer produced it for REVERSING, a University of Florence research project developing retrofit facades for schools and offices. Tested in a reverberation chamber according to ISO 354, the panel reached a weighted sound absorption coefficient (αw) of 0.90, Class A under ISO 11654.

Compared with a mineral wool panel alone, it reduced reverberation time by 41% at 500 Hz and 45% at 1,000 Hz. It also raised the Speech Transmission Index (STI), a measure of speech intelligibility, from 0.47 to 0.52. The results are published in “Designing Sound with Geometry: A Hybrid 3D-Printed Acoustic Panel” in AM Perspectives, and in a second paper on additive