An airlift pump is a simple device with no moving parts which elevates water with air pressure - kind of the opposite of a trompe. All that's needed is a ready supply of moving air. It lifts water gradually and reliably.
These ones use standard 1/4" aquarium tubing and fish bubbler pumps. They're small+streamlined enough to fit through a pop bottle neck. It can lift water over five feet, using the cheapest air pump petsmart had. I've had several of these reliably watering plants for months.
It prints in two parts, the main body and the hose barbs. Print in ABS, glue together with ABS pipe cement.
Two barbs fit atop, the inlet and outlet. The straight-through pipe is the outlet, which belches air and water upwards. The one that stops halfway is the air inlet. There's a small connection between it and the straight pipe to let air into the stream.
The fitting on the bottom is the inlet. You should add a length of tubing to it -- it stops air from bubbling out of the bottom too easily if the top tube becomes "full". Somewhere between half a foot to a foot of tubing seems to work for me. Loop it back up to the clip on the side.
Name Last modified Size Description
Parent Directory - liftpump-5.stl 2014-12-21 11:55 123K Single-output pump little-pot-clip.stl 2014-12-23 04:07 11K Holds hose to a plastic pot little-pot-clip.jpg 2015-04-06 14:14 30K airlift-diagram.jpg 2015-04-07 21:33 49K Airlift Pump airlift-principle.jpg 2015-04-07 21:33 12K Airlift Pump barb-small-x7.stl 2016-02-23 09:14 1.1M Seven hose barbs with brim barb-small-x7_preview_featu..> 2016-02-23 09:14 42K diagram_preview_featured.jpg 2016-02-23 09:14 27K single.jpg 2016-02-23 09:14 76K liftpump-6.stl 2016-02-27 19:37 146K Dual-output pump barbs.jpg 2016-02-27 19:44 42K dual.jpg 2016-02-27 19:44 84K liftpump-5.scad 2017-01-10 02:59 12K Single-output pump sourcecode liftpump-6.scad 2017-01-10 03:01 6.9K Double-output pump sourcecode airlift-bubble.gif 2017-04-05 19:17 641K Airlift Pump airlift-diagram-complete.png 2017-04-05 21:20 157K Airlift Pump