This PDF file includes:

• Detailed Materials and Methods
• Biocompatible studies with PI nanoparticles and 3D printed hydrogels.
• Determination of 3D printed hydrogel water content.
• Determination of 3D printed hydrogel mechanical strength.
• Fig. S1. Effect of storage temperature and duration on size of TPO nanoparticles.
  
• Fig. S2. Cryo-TEM image of an aqueous dispersion 0.1%(w/w) of powder containing 25%(w/w) TPO.
• Fig. S3. Stability of TPO in an aqueous dispersion 1.6% (w/w) of spray-dried powder at different time intervals after filtration through 0.22-μm PVDF filters.
• Fig. S4. X-ray diffraction patterns for spray-dried powders containing TPO nanoparticles after 85 days of storage at 25°C.
• Fig. S5. Polymerization kinetics.
• Fig. S6. Effects of TPO nanoparticle concentration on cell viability.
• Fig. S7. Relative cell viability of Huh7 liver cells cultured on different substrates.
• Fig. S8. Mechanical characterization of polyacrylamide hydrogel fabricated with TPO nanoparticles.
• Table S1. Composition % (w/w) of the microemulsions before spray drying.
• Table S2. Theoretical composition in % (w/w) of the spray-dried powders.
• Table S3. Molar extinction coefficients of TPO nanoparticles and I2959 at standard center wavelengths of light sources used for DLP-based 3D printers.
• Table S4. Summary of different light sources used for hydrogel formation.
• Table S5. Summary of photopolymerization results using different water-soluble PIs with aqueous acrylamide solutions in air at 25°C.
• References (42–64)

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