Original part broke so I decided to design a replacement one. After 4 trials, this version fits my vacuum cleaner fine and gives a performance similar to the original. 

Sliced it with prusa slicer with following settings:

print it topside down. 

Nozzle: 0.4

Matrerial: PETG

Perimeter: 6

Solid layer: top 6  -  bottom 6

Infill: 50%

Support: Organic: z distance 0.25; pattern spacing 3mm; xy separation 75%