Compared to existing acrylate-based resins for SLA printing, our elastomers possess an exceptional combination of low stiffness and large extensibility (Figure ). For instance, solely acrylate-based resins have the minimum Young's modulus E of ~400 kPa (light blue, magenta, and orange region, Figure ) while acrylate-based resins filled with ionic liquids have a minimum E of 270 kPa (purple region, Figure ) . Thiol-ene chemistry double-network resins (light green region, Figure ) and silicone-based resins (dark green region, Figure ) are softer (E, 6-670kPa) but not very stretchable (𝜖 𝑓 < 430%) . Commercially available resins are even more limited with typical 𝜖 𝑓 < 400% and E>1 MPa (Table ). By contrast, our acrylatebased resins are both soft and stretchable (E<100 kPa and 𝜖 𝑓 > 500%; red circles, Figure ).