Downpipe adapter 110mm to 90mm (HT-Rohr, Abflussrohr)

Hi there.
I had to create a downpipe-Adapter (HT-Rohr, Regenwasser-Fallrohr) to install a rainwater-assembler (down know the words in english). I can't find an adapter from 110mm (outside of downpipe) to 90mm (rainwater-assembler entry), i've created one.

I added 1mm extra radius on bottom and top; it fits perfectly (as you can see on the picture).

Printed it with ABS without support; be sure to print the end with the bigger radius downside to the heatbed.