Hydroponic (or whatever) wall hanger
thingiverse
It's a convenient holder that fits screws through two holes. I'm setting up my own hydroponic system based on the 3D-printed design from http://www.3dponics.com, which is available on thingiverse for public access. To achieve stability, use reinforced or denser material according to your choice of load weight.
Download Model from thingiverse
With this file you will be able to print Hydroponic (or whatever) wall hanger with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Hydroponic (or whatever) wall hanger.