Created as an extension to a rainwater pipe, in Dutch called Hemelwaterafvoer or HWA.

I designed this so the model fits both inside and on top of a rainwater drain pipe at 80mm.

For my situation it had to fit inside a Martens brand bend of HWA.

Print with PETG or ABS at, at least 25% infill.

The walls are very tin, but as a whole it has enough structural strenght as long as nobody tries to stand on top of the pipe.