◆ Concrete
Concrete cracked sphere candle vessel mold
A broken-open concrete sphere, 120 mm across, as a three-wick candle vessel. A silicone mold kit from printed parts.
◆ Concrete
A broken-open concrete sphere, 120 mm across, as a three-wick candle vessel. A silicone mold kit from printed parts.
A concrete candle vessel shaped like a sphere broken open: 120 mm across, standing on a 70 mm flat foot, its top cracked away along a jagged rim of shards and notches. It stands 72 mm tall at its highest shard. Inside, an 8 mm wall and a flat floor 72 mm across, room for three wicks. Fill it with soy wax for a three-wick candle, or plant it with a small succulent. The vessel is 209 ml, about 459 g in concrete.
Made with the box mode of our silicone mold maker in its round shape, the mode the tool itself suggests: the sphere is wider at its middle than at its foot, so the silicone block is slit open once to free the master, and the inside becomes a silicone core standing in the block. Print the base with the vessel fused onto it, the two walls and the two clamps, and pour about 1380 ml of silicone.
Cast it grey, charcoal or white, or sand the shard edges smooth for a softer break. The zip carries every printed part, the vessel 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 with the master fused onto it, the two walls and the two clamps.
Stand the base on the table. Set each wall down a few centimetres out from it and slide it in over the table until the ridge round the base sits in the groove at its foot, then slide the clamps down over the seams. Once they are on, the walls cannot lift, and the ridge seals the bottom.
Mix 1460 ml of silicone in one batch and pour it in a thin stream down the inside of a wall, letting it rise round the master and into its well until it covers the top.
Once it has cured, take the clamps off and slide the walls straight out. The vessel is wider higher up than at its foot, so cut one straight slit down the side of the block with a sharp knife, from the open face to about 10 mm short of the top, open it like a book and lift the master out.
Turn the block over and stand it back inside the walls with the clamps on, which hold the slit shut. The opening is the foot of the vessel, with the silicone core standing up in the middle.
Mix a fine concrete or Jesmonite a little wetter than for a slab, pour it slowly down one side of the ring round the core, and tap the walls for a minute to raise the air. Fill level with the opening and strike it flat.
Leave it to cure for a day, take the walls off, open the slit, peel the silicone off the outside and twist the vessel 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 | 5 |
| Size (W x D x H) | 148 x 148 x 110 mm |
| Print bed needed | 170 x 148 mm, 110 mm tall |
| Filament | ~398 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 5 printed parts (STL) + candle vessel master (STL) + print sheet + recipe |
| Added | 2026-10-01 |
Made with the free Silicone mold maker generator. Upload your own model and get the same kind of mold built around it, in your browser.
Free download. Opens the Thingiverse listing in a new tab.
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.
About 180 g of soy wax (about 200 ml), filled to 10 mm under the lowest notch in the rim. To check your own cast, fill it with water to that line once before you seal it: the water in grams, times 0.9, is the soy wax you need.
Yes, once it has cured for a few weeks and the inside is sealed with a heat-resistant sealer: concrete does not burn and a soy candle barely warms it. Always stand it on a heat-safe surface and never leave a candle alone. Use three wicks sized for the 72 mm floor so the pool melts to the wall.
Not with the shards it has: the wall is 8 mm thick all the way up and every edge is rounded. Use a fine concrete or Jesmonite with no gravel, vibrate it well so no air sits in the shard tips, and let it cure a day before you peel the core out.
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