◆ Concrete
Concrete candle jar mold
A straight concrete candle jar, 80 mm across, for the classic 8 oz candle. A silicone mold kit from printed parts.
◆ Concrete
A straight concrete candle jar, 80 mm across, for the classic 8 oz candle. A silicone mold kit from printed parts.
A straight candle jar 80 mm across and 85 mm tall with a softly rounded rim: the plain concrete vessel candle makers pour their own container candles into. The well is 66 mm across at the rim and 63 at the floor, 75 mm deep over a 10 mm floor, and holds about 235 ml to the brim, the classic 8 oz candle.
Made with the hugging-shell mode of our silicone mold maker, which the tool itself suggests for this standing jar: the silicone follows the jar instead of filling a box, so the mold takes about 558 ml. Print the base with the jar 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, so each jar comes out hollow with no insert.
Seal the inside before the first pour so the fragrance oil cannot soak into the concrete, then fill it with soy, coconut or paraffin container wax. A set of jars in grey, white and charcoal sells well next to refills. The zip carries every printed part, the jar 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 601 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 jar. 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.
Demold after a day: peel the silicone skin off the sides from the open foot and twist the jar off the core. Sand the foot flat and seal it.
Seal the inside with two coats of a heat-resistant concrete sealer and let it cure as long as the tin says before the first pour of wax.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 9 |
| Size (W x D x H) | 120 x 120 x 102 mm |
| Print bed needed | 120 x 97 mm, 102 mm tall |
| Filament | ~286 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 9 printed parts in 4 STL files + candle jar 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.
Yes, once it is sealed. Concrete does not burn, but it is porous, so seal the inside with two coats of a heat-resistant sealer before the first pour or the fragrance oil soaks in and darkens it. Stand the lit candle on a heat-proof surface: the jar gets warm on a long burn.
About 235 ml to the brim, so roughly 200 g of soy or paraffin wax once you leave the usual 5 to 10 mm under the rim: the classic 8 oz candle. The well is 66 mm across, so start with one wick rated for a 65 to 70 mm pool in your wax, and test burn one before you make a batch.
Because it holds wax, not soil, and a hole would leak the candle. The planters in this library get their hole from a pin on the silicone core; this core has a plain round tip, so the floor casts solid, which also puts 10 mm of concrete between the flame and the table.
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