If you want to experiment with the ideas in this project but don’t have a 3D printer, then you can easily make siphons using plastic tubing and plastic bottles with the bases cut off.

If you pierce a hole in the cap of a plastic bottle then the hole tends to want to shrink. This behaviour will make a water tight seal around a piece of tubing inserted into the hole. The tubing can be looped up against the side of the bottle and held in place with a rubber band. To make the ‘splitter’ at the output of each siphon, I purchased an off-the-shelf Y connector that fits the plastic tubing.

You can see bottle-siphons constructed in this way in this video:

The splitters in this video were made from plastic milk bottle tops rather than the off-the-shelf Y connectors mentioned above. Sorry about the poor quality of the video.