Okay, so I've been through like 5 different 'flexible' resins that promised rubber-like properties but ended up being either too brittle or weirdly sticky. This YOUSU 80A stuff? Actually delivers.

The shore hardness is perfect - my printed phone case can survive being sat on (tested... multiple times) while still having that satisfying squish. Made custom insoles for my running shoes and they haven't cracked after 3 months of abuse!

What surprised me most was the detail retention. Printed some articulated dragon toys for my niece and all the tiny scales came out crisp. The black color hides layer lines way better than translucent resins I've tried.

Pro tip: Shake this like a cocktail for a full minute before printing. Had one failed print early on because I got lazy with mixing. Also wear gloves - this stains fingers worse than squid ink pasta.

Only gripe? The bottle design makes it impossible to pour neatly. I always end up with resin dribbles down the side - hence the 4 instead of 5 stars. But performance-wise? Absolute gamechanger for functional prints.