Filter cleaning adapter for Cecotec Conga

A remix on fns720 design. Quoting his description:

The official robot cleaning guide says you have to clean the dusty filter with tapwater. If you do so you close the pores of the filter by creating a thin, cement-like layer on the filter's surface and it will be useless after a couple of cleanings.
To prevent this clean your Xiaomi filter just by using an old vacuum cleaner instead and you will never have to buy new filters again in every month or so!
Just connect the Xiaomi Mop Pro's filter to the old vacuum using this adapter and turn on the suction and in a few seconds the filter will be cleaned properly.

This adapter is for 31 mm vacuum tubes. I printed it in four parts, to avoid long printing time.