Self watering seedling box
thingiverse
Made these little 5cm x 6xm self watering boxes with every intent for seedlings (various trees and herbs), though currently I've found having them on hand for small plant triage and unplanned propagation just as useful. Small enough to fit well clustered together. Note that if you're planting a lot of seeds there are other options and printables that might be more suitable. Watering each one can get tiresome
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