You can use this as propagating station, simply put your plant cuttings in the cups, fill the cups with something like rock wool to keep that plant straight. You can also add LEDs to the top, there is a channel for a cable.
You can also use it as a normal planet by filling the reservoir with soil.
You can re-scale the connecting pins to make them taller, this will lift the top part and make more space for taller plants.
I've spent a lot of time drawing, printing and improving this model. However, I still feel like there's a lot of space for improvement, especially when used as a planter, it would be nice to have self-watering capability. I've included the Fusion360 drawing. It's quite messy, but you should be able to modify it or at least re-use some portions of the model.
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The author marked this model as their own original creation.