This Succulent Planter is based off of the Dungeons & Dragons Beholder.

This has a 2.25 inch opening and it's suitable for a ~2inch diameter pot or for direct planting.

This is designed to be printed support free. However, if you don't have the best bed adhesion and print cooling you might want to add a brim and some tree supports to prevent the tentacles getting knocked down.

I recommend 3 outer walls and at least 15% infill.