> Complex geometries with zero to varying porosities and 280 μm feature size are printed by our method, > real printing is conducted with as low power as 20 W.

> Complex geometries with zero to varying porosities and 280 μm feature size are printed by our method, > real printing is conducted with as low power as 20 W. The maximum streaming velocity is 20 mm/s for 210 W power, however, it is less than 3 mm/s for 20 W > The PDMS system used in this paper is Sylgard 184, which is a two component system. The elastomer and the curing agent contain vinyl-terminated siloxane and Si-H moieties, respectively. > Since we printed Sylgard-184 directly and purely without adding any toxic additives, the biocompatibility of the printed parts are expected. > The printed parts are washed with isopropanol alcohol (IPA) to remove the uncured materials (similar to SLA printed parts) from the surface of the printed parts. Then the parts are placed in a 40 °C oven for half an hour for drying the washed parts and complete the curing process. Cool tech. At 2.4 MHz, they're not joking calling it ultrasonic.