I don't like saucers under planters, so I wanted a very simple planter that doesn't need it, but allows the excess water to be drained from the bottom of the planter.
Be sure to set right the flow to have watertight bottom, but there should be no difficulties as the design is support free.
Modelled (and image rendered) in Blender. The original file is here too if you want to see how it's made.