◆ Concrete
Four concrete Christmas trees from one silicone mold, 85 to 110 mm tall: a smooth cone, a ribbed cone, a stepped tree and a faceted one.
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A silicone mold for four concrete Christmas trees, each 60 mm across the base: a smooth cone 110 mm tall, a cone with twelve ribs 95 mm tall, a stepped tree of four tiers and a top 90 mm tall, and an eight-sided faceted pyramid 85 mm tall. The four take 371 ml, about 816 g in concrete.
Made with our tray mold generator in its flexible silicone tray mode: print one part, a caster, pour silicone into it and peel it out. That silicone is the tree mold. The trees are cast tip down, so every cavity only widens toward the base you pour through: the silicone peels off each tree in one go, and the base comes out flat to stand on.
Set them in a row of four heights on a mantel or a windowsill, dust the tips white, gild the ribs, or cast them in white Jesmonite. Concrete trees are one of the best-selling Christmas pieces at craft markets. The zip carries the printed caster exactly as the tool exported it, the four trees on their own as an STL, the master uploaded to the tool, and a print and pour sheet with the silicone figure the tool measured.
Shown as a 3D render of the printed caster beside the silicone mold it pours, with the four concrete trees standing in front, not a photo.
Print the caster as exported, open side up, no supports. PLA is fine.
Set it on a level surface. Mix 1890 ml of silicone in one batch and pour it into one corner in a thin stream, letting it rise round the four raised trees until it is level with the rim. Tap the caster for a minute and let it cure as long as its datasheet says.
Peel the cured silicone out of the caster. That silicone is your mold: four tree cavities, tips down.
Mix a fine concrete or Jesmonite to a pourable cream, fill each tree slowly to the rim so the air can rise out of the tip, and tap the mold for a minute. Strike the bases flat.
After 24 hours peel the silicone down off each tree from the base. Let them cure a few days more, sand the bases flat and seal them.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 1 |
| Size (W x D x H) | 156 x 156 x 124 mm |
| Print bed needed | 157 x 156 mm, 124 mm tall |
| Filament | ~484 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed caster (STL) + one set of four trees (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-10-30 |
Made with the free Tray mold generator. Upload your own model and get the same kind of mold built around it, in your browser.
ZIP: printed caster (STL) + one set of four trees (STL) + tool master (STL) + print and pour sheet
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 ice cube tray mold guide.
Use a fine mix with no gravel (a craft cement or Jesmonite), pour it a little runnier than usual, and fill each cavity slowly down one side so the air leaves the tip first. Then tap or vibrate the mold for a minute. A rounded tip is almost always trapped air.
The four together are about 816 g in concrete, the tallest about a third of that. They stand firmly on their 60 mm bases. In Jesmonite they come out roughly half as heavy and a little whiter.
The master is in the zip: upload it to the tray tool, scale it up and download a new caster in a minute. Keep the trees under about 150 mm tall on a common printer bed, and allow more silicone, which the tool shows before you download.
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