Great for hanging tomato plants and other vines in a greenhouse. A frame has been made around the twist clip. This can be cut off with a penknife so the hanger slots in flush with a slot.This was designed using freecad on a self build modified Prusa i3. I've uploaded an updated design I did using FreeCAD made as a complete part. The file relates to my other plant hanger design, the plant hanger mini which I slimmed down and made the hole bigger. I found it simpler to make it in two parts and glue them together. Hopefully the sections are labelled in the file to make it easier to find your way around it.