This is a model for a hydroponic tower which can be 3D printed, this part is the main stackable piece and multiple of them can be sacked on top of each other at a 45° rotation angle to alter the pockets between each two pieces for better plants growth. the parts are designed to fit snag either the outer perimiter or the inner tube for water flow although this one might need some form of sealing if needed (not tested yet).

In the near future there will be added a base and top cover for the tower but these are not very critical as only the stackable part is most relevant one, still I'm going to add these two for well finished hydroponic tower.

I've added some pictures with important dimenssions, if not suitable for your application feel free to scale the whole part if that works for you especialy with the middle tube, otherwise you can contact me to change the dimenssions base on your needs.