From the book LEO the Maker Prince:
leothemakerprince.com
amazon.com/LEO-Maker-Prince-Journeys-Printing/dp/1457183145
When George wanted to personalize his new apartment, he came up with this design for this microgreens planter and handle combination that can be hung on a cabinet door. The main part of the planter sits atop a smaller knob that can be screwed into place. There's a reservoir at the bottom for water.
This piece can be ordered in ceramic (pictured) from Shapeways, or built in plastic.