Miniature model of a folding ladder for your plants to climb. Print two and connect with a piece of filament through the holes at the top, or just print one and lean it on something. 

As an added bonus, the filament at the top is close enough in size for a Lego minifigure to hook onto!

The ladder is roughly 1.5" wide by 8.5" tall, and the OnShape file is here.