Bell siphon (tuned)

Tuned bell siphon based on https://www.thingiverse.com/thing:2119390 (parametric OpenScad). Design is targetting a growbed about 11-13 cm deep and works fine without the bottom cup (see further tuning below). We used 20mm diametrer and 9cm height. Tickness of 1mm for reducing printing time (looks rigid enough).

Model is upside down ready to print.

Post-print tuning: the design will probably not work directly because snorkel is quite long and will not allow the siphon to stop without the cup accessory (depending on pump flow and exit diameter). To fix this, you can just try to cut small bits off the snorkel until you can reach the point where the air will flow in to stop the siphon.

in our case:
- snorkel cut at 3cm from bottom (so min water = 3cm)
- max water = 7.5cm, leaving about 4cm dry on top
- exit diameter=8mm
- growbed of about 10l
- tide time about 4:15 min (2:30 up and 1:45 down)
- pump: low debit (air powered actually using our venturi design https://www.thingi