These stackable planters can go as high as you want. They have a small groove in the base that sits on the top of the planter below it. The current scale will was set for a 220 mm build plate and will fit up to a 55 mm small pot in each spot. If you have a bigger printer, use that scale factor to figure out what you can fit in there! Your printer is the only limitation.
I would not advise scaling down more than about 50%. The walls start to get thin below that, but thats up to you to experiment with.
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