LEGO (vacuum) venturi flow meter
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a working venturi flow meter to use with LEGO, works with vacuum
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- Creative Commons — Public Domain
i wanted to measure the airflow in lego vacuum engines, after long searching i found out that venturi flow meters could be used with vacuum, so i made v1, satisfied with the results i made v2, now compatible with lego, so you can incorporate it in your lego builds
the venturi requires the 4132 window part, i bought fakes from aliexpress, the total length should be 11 studs, or 88mm
diameter small hole: 14mm
diameter large hole: 20mm
you also need to glue 3mm tube to the holes, i reinforced the tubes with a fake 1 round plate with hole
you also need 2 vacuum pressure sensors (-100 to 0 kpa) and an arduino board, the code is quite involved
designed in freecad, i used cura for slicing
UPDATE aug-2026: uploaded ALL freecard project files, same copyright applies