This modular hydroponics tower lets you grow a large amount of plants without the need of lots of room. Each module fits 3 50mm (2 inch) pots and has the water tube running up the middle. Just stack as many modules as you require.
Each module is designed to fit 3 M3x4x5 heat-inserts and bolt together using M3 x 6mm bolts.
I designed this to fit on a small 3D printer, with a build area required of 170 x 170.
At the bottom of the stack you need the Base with a 16mm barb fitting and the optional base clamp (to clamp to the other side of a container lid) and attach it to a submersible pump.
At the top you push in the shower head and bolt on the lid. I drilled out the holes of the top module to 4.5mm to fit in 3 heat-inserts to make this secure but it does function fine without the lid bolted down.
Have fun growing!