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Size it up/down as you wish - make it small, medium, or go large!
I suggest adding some felt pads to the bottom to minimize the probability of scratching your table/floor, and to ensure some ventilation under the planter/saucer to minimize condensation issues.

SETTINGS / PRINTING (recommendation)

Filament: PETG or PLA. Please note that PLA can deform/break down in the sunlight. In addition, some types of PLA are biodegradable.
Print: 0.2mm
Nozzle: 0.4mm
Support: Not required
Brim: Not required
Infill: 5-25% (depending on the size of the planter, soil type, plant size, etc)
Perimeters: at least 2, best 3 (minimizing probability of holes and water damage to your table)
Vase mode: No. While it is tempting to 3D print planters in the Vase mode, I find that there is just not enough fusion between the layers. In addition, a few micro-holes may appear during the sanding/handling of the finished planter. The water will find its way, even through a rock, so there's no reason to risk it.

OTHER

- If you are really worried that the planter might leak, use a waterproof sealant spray (for example Rust-Oleum Crystal Clear) inside of the planter, 3-4 coatings should be enough.
You could also read the official Prusa blog post “Watertight 3D printing PT1: Vases, cups and other open models”.

- To make the planter smooth and shiny, you could use sandpaper, prime it, (spray)paint it a couple of times and use a varnish coat on top.

Happy Printing!

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