dissolution PA filament was extruded with a 3D printer head (Prusa i3 Mk3, Prusa Research) to obtain strings with diameters between 150 µm to 250 µm. These extruded strings were held by a 3D printed structure which was glued to the bottom of a glass cuvette (22.5 x 25 x 25 cm 3 ) and submerged in CEW E, see Figure . Sonication was done with a sonotrode (Sonopuls Ultrasonics homogenizer UW2200, Bandelin) with a 2.0 mm diameter probe tip. The sonotrode was driven by a linear amplifier (AG1020, T&C Power Conversion Inc) which obtained its signal from a signal generator (DG1022Z, Rigol Technologies EU GmbH). This allowed to have precise control over the ultrasound exposure. A LED light source was placed at the back of the sonotrode and a high-speed camera (Photron FASTCAM Mini, AX200) was used to record the sonication process from the front.