A fluted planter for a houseplant from a 12 cm nursery pot, with a hidden 0.6 litre water reservoir underneath. Pour water into the funnel at the back; the soil in the slotted basket draws it up to the roots, and a yellow float shows how much is left. No wick cord, no screws, and every part prints without supports.
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The outer pot and water tank: 30 flutes outside, a smooth closed cup inside with the fill tube at the back. Holds 0.6 litre up to the full mark.
Holds 1.8 litres of soil: 145 to 152 mm across and 118 mm deep, so a 12 cm root ball fits with room to spare. Its flat floor stays 6 mm above the water, with drainage slots and a hole for the basket; a channel at the back slides over the fill tube.
A slotted cup that hangs through the floor of the inner pot and stands in the water. Packed with soil, it is the wick.
A funnel that plugs into the fill tube. Water pours through five windows; the rod slides up through the middle.
A sealed float with a closed air pocket inside. It rides up and down in the fill tube.
Presses into the float and shows the level at the cap. Two grooves mark half full and full.
For a 0.4 mm nozzle. Filament amounts are estimates for these settings.
Print the reservoir with 4 walls and 5 top and bottom layers. Fill it with water and leave it on a paper towel for a day: if it weeps, coat the inside with a thin layer of sealant.
Press the flat rod into the slot on top of the float, round end up and the grooves facing you. It is a press fit: no glue needed. Float it in a glass of water: if it slowly fills and sinks, print it again a little hotter.
Lower the inner pot into the reservoir with the channel at the back over the fill tube; its bevel settles on the rim and centres it. Drop the float into the fill tube, rod up, and press the cap into the tube with the rod through its middle.
Push the basket through the hole in the floor from inside and pack it firmly with potting soil. Add a layer of soil, set the root ball in a little forward of the centre, fill round it and water from the top the first time, so the soil is wet all the way down.
Pour water into the cap's funnel until the second groove on the rod is level with the top of the cap. That is full: about 0.6 litre. Don't fill past it, or the soil will stand in the water.
When the rod has sunk back flush with the cap, the reservoir is almost empty. Most plants need a refill every one to three weeks.
PLA softens at about 55 °C: keep a PLA planter out of strong sun behind glass, or print it in PETG. Printed parts are not food safe, so don't use the reservoir for drinking water.
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