In this work Nylon PA 6 Low Warp filament was purchased from Spectrum Filament with a circular cross-section ( The ultrasound bath Bandelin Sonorex RK 106 (35 kHz) was employed for solvent formulation and Bandelin Sonorex RK 102 h (35 kHz) was used for the dissolution procedure. As visible from measurements in supplementary information (S9) †, the acoustic pressure from peak-to-peak was 0.8 bar with the main frequency being the driving frequency supplemented by harmonics and subharmonics. The Discover 2.0 microwave synthesizer from CEM Corporation (2.45 GHz) was used for the microwave dissolution experiments. Whatman grade glass fiber filter papers GF 92 were purchased from Cytiva.