I use these plastic shot glasses for my plant cuttings. 

Amazon.com: Comfy Package Clear Hard Plastic Shot Glasses [1 oz. - 100 Count] Disposable Shot Cups : Health & Household

They're roughly 40mm tall, 40mm diameter on top and 30mm diameter on the bottom. You could most likely scale the model to fit different sizes if you prefer. Anyway, I was knocking them over all the time and they were super disorganized so I made this!

Print with the legs up and with a brim.