Currently, the majority of SLA resins are acrylate-based photocurable polymers, which often form highly crosslinked stiff, brittle networks . The commercially available photopolymers for SLA printing, including variants such as Continuous Liquid Interface Production (CLIP) and Digital Light Processing (DLP) , have the lowest Young's modulus of approximately 1 MPa . The Young's modulus of acrylate-based resins can be lowered to ~500 kPa by optimizing the selection of monomers or to ~250 kPa by using ionic liquids as fillers . However, the stiffness of these resins remains to be higher than most soft biological tissues (~1-~100 kPa) , limiting their applications where contact with biological objects is required. Instead of using small acrylatebased monomers as precursors, crosslinking precursor polydimethylsiloxane (PDMS) by light-triggered thiol-ene click chemistry enables resins with tunable stiffness (Young's modulus E of 6-283 kPa) and stretchability (tensile breaking break 𝜖 𝑓 of 50-400%) . Introducing a secondary silicone-based network, that can be thermally cured post-printing, further enhances the mechanical properties of the resin (E, 100-670 kPa; 𝜖 𝑓 , 180-410%) . Lowering the stiffness and increasing the stretchability of elastomer resins could significantly expand their applications where materials are required to be easily deformed by a large extent without fracture. However, it remains a challenge for high-fidelity additive manufacturing of elastomers that are both soft (E<~100 kPa) and stretchable (𝜖 𝑓 > 500%)