Greetings,

straight to the point here is one of the version. I designed the venturi by following the ASME standard (ASME MFC-3M-1985)
You can find my original upload on youmagine.com, refer to https://www.youmagine.com/designs/ve...ernal-diameter
Technical drawing is included on youmagine.
The parts is printable, but is hard. Considering the object height /base ratio is high, it is strongly suggest that you print a thick layer of brim. Else your base will just lift and your print will be completely ruined.

-Instruction
Rotate the venturi on the axial direction. Make sure the flat flange is at the bottom.
Apply thick layer of brim

large_Venturi_tube.jpgventuri.jpg
Venturi_flow_meter.stl