1：Experimental Design and Method Selection:

The study used digital light processing (DLP) 3D printing with visible light to fabricate hydrogels from SF-PEG4A precursor solutions, incorporating cells for tissue engineering applications.

2：Sample Selection and Data Sources:

Silk fibroin particles were prepared from Bombyx mori silk cocoons; PEG4A was synthesized; fibroblast and keratinocyte cells were cultured.

3：List of Experimental Equipment and Materials:

Equipment includes a digital rheometer (MARS III, Thermo Scientific), universal testing machine (LRX Plus, Lloyd Instruments), scanning electron microscope (SUPRA SSVP, Carl Zeiss), confocal laser scanning microscope (Carl Zeiss), microplate reader (Synergy HT, BioTek), projector (Vivitek), and software (Rhinoceros

4：0, XMaker). Materials include PEG-hydroxyl (JenKem Technology), acryloyl chloride (Sigma Aldrich), triethylamine (Sigma Aldrich), N-vinylpyrrolidone (Sigma Aldrich), eosin Y disodium (Sigma Aldrich), triethanolamine (Sigma Aldrich), DMEM (Invitrogen), fetal bovine serum (Life Technologies), penicillin/streptomycin (Life Technologies), LIVE/DEAD viability/cytotoxicity kit (Invitrogen), alamarBlue (Invitrogen), rhodamine-labeled phalloidin (Life Technologies), DAPI (Sigma Aldrich), and others. Experimental Procedures and Operational Workflow:

Steps include preparation of PEG4A and SF particles, mixing precursor solutions, 3D printing with DLP, cell culture, viability and proliferation assays (live/dead, alamarBlue), cell adhesion staining (phalloidin/DAPI), and epidermal differentiation at air-liquid interface with H&E staining.

5：Data Analysis Methods:

Rheological and mechanical properties were analyzed; cell viability and proliferation were assessed using fluorescence and absorbance measurements; statistical analysis was performed.