Customizable planter holders

**Do not use these to hang pots where they could fall on people**

I bought these quarter-sphere planter boxes without realizing how poorly designed they were for actually being hung on anything. They just have a ridge on the back, with a little notch on either end. I used OpenSCAD to make these holders fitting the notch, so that they would be kept in place sideways. Using PLA, they lasted for a full summer on a south-facing balcony, though with some distortion noticeable afterwards. Depending