◆ Concrete
Ripple concrete planter mold
A ring-stack planter, 85 mm tall with five soft ripples, to cast in concrete. A silicone mold kit from printed parts.
◆ Concrete
A ring-stack planter, 85 mm tall with five soft ripples, to cast in concrete. A silicone mold kit from printed parts.
A ripple planter 85 mm tall and 85 mm across: five rounded rings stacked round a straight core under a flat rim band, the soft ring-stack look of modern studio pottery. The valleys between the rings are rounded, never a knife edge, and the well is a drafted cylinder 58 mm across at the rim over an 11 mm floor with a 10 mm drainage hole.
Made with the hugging-shell mode of our silicone mold maker, which the tool itself suggests for this standing, rippled pot: the silicone follows the rings instead of filling a box, so the mold takes about 575 ml. Print the base with the planter fused onto it, the two shell halves and the six clamps, and pour into the open top. The silicone fills the well as it rises and becomes the core, with a pin that forms the drainage hole.
The skin flexes over the rings to let each cast out, so there is nothing to cut. Cast it in white Jesmonite, pale grey concrete or a soft pastel pigment. The zip carries every printed part, the planter master as its own STL, the tool's own print-settings sheet and a recipe file for the generator.
Shown as a 3D render of the printed mold parts pulled apart around the master, not a photo.
Print the base, which has the master already fused onto it, the two shell halves and the six clamps (all six are in clamps.stl). No supports.
Stand the base plate on the table, set each shell half down a few centimetres out from it and slide it in until the ridge round the plate sits in the groove at its foot. Push the six clamps over the seams: the shells cannot lift after that, and the ridge seals the bottom.
Tape the outside seams or run a bead of hot glue along them, because silicone finds every gap.
Mix 619 ml of silicone in one batch, pour it into the open top in a thin stream, and fill level with the rim. It fills the well as it rises and becomes the core.
Once it has cured, take the clamps off, slide each shell half straight out and peel the silicone off the master the way the last step describes. That silicone is your mold: a skin with the core standing inside it.
Turn the silicone over and set it back in the shell to keep its shape: the opening is the foot of the planter, with the drainage pin on the tip of the core. Pour a fluid concrete or Jesmonite slowly down one side, tap the shell for a minute to raise the air, and strike the foot flat, wiping the pin tip clean.
Demold after a day: peel the silicone skin back off the rings from the open foot, a little all round at a time, and it flexes over each one. Then twist the planter off the core. Sand the foot flat and seal it.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 9 |
| Size (W x D x H) | 131 x 130 x 102 mm |
| Print bed needed | 130 x 103 mm, 102 mm tall |
| Filament | ~362 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 9 printed parts in 4 STL files + planter master (STL) + print sheet + recipe |
| Added | 2026-09-26 |
Pro early access until October 26, 2026, then free with any account.
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Free for personal use. Selling the pieces you cast needs a commercial licence (Pro or Founder); passing on the file itself is not permitted on any plan. Full terms.
New to casting? Read the silicone mold maker guide.
The hugging shell makes a silicone skin about 10 mm thick, and it stretches over each ring as you peel it back from the open foot, the same way a candle leaves a bubble mold. Work round the pot a little at a time rather than pulling one side, then twist the planter off the core.
A few can: the pot is cast upside down, so each ring's groove in the silicone has a small ceiling where air rises to. Pour slowly down one side and vibrate the shell for a full minute, and any pinholes that stay end up on the underside of a ring, where they barely show once the planter stands up.
About 634 g in ordinary concrete, from a 288 ml cast, and a little less in Jesmonite. The rings make it feel solid in the hand, and felt pads under the foot stop it scratching a shelf.
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