Wall-mounted Flower Pot

Print the pot "upside down" to facilitate printing. You'll need to use supports (arborescent, for me). Internal supports can be a little tricky to remove, depending on your settings.  The tolerance between the pot and the clamp is deliberately small, so you'll need to file the back of clamp a little to get a perfect fit (depending on your print quality).  For an excellent seal, you can paint/varnish the inside of the pot.