rainpipe water diverter. its a work in progress but it works
main function is to catch water and not cause a vacuum in the rainpipe because its a closed off section
its suited for standard 80mm pvc pipe including the sleeve to fit and hold it in place
input 80mm output 50mm
for best results print in ASA upside down (ASA since its UV resistant) asa also sticks properly well to pvc glue making it ideal for its usage
Edit: added action photo
The author hasn't provided the model origin yet.