◆ Concrete
Concrete square bud vase mold, test tube vase
A square concrete bud vase with a glass test tube inside, 50 x 50 x 120 mm. A silicone mold kit from printed parts.
◆ Concrete
A square concrete bud vase with a glass test tube inside, 50 x 50 x 120 mm. A silicone mold kit from printed parts.
A minimal concrete bud vase, a square column 50 x 50 mm and 120 mm tall with softly rounded edges and a round hole 90 mm deep down its middle for a standard 16 mm glass test tube (16 x 100 or 16 x 125 mm). The tube holds the water, so the concrete never stays wet, and lifts out to rinse. One stem of eucalyptus, a dried grass or a single tulip is all it needs. It is 280 ml, about 616 g in concrete, so a tall stem does not tip it.
Made with the box mode of our silicone mold maker in its rectangular shape, the mode the tool itself suggests: the column has no undercuts, so the silicone block slides off whole with no cut, and the tube hole becomes a long silicone pin standing in the block. Print the base with the vase fused onto it, the two walls and the two clamps, and pour about 517 ml of silicone.
Cast a row of three in grey, charcoal and white for a windowsill, or tint one terracotta. The zip carries every printed part, the vase 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 558 ml of silicone in one batch and pour it into a corner, letting it rise around the master until it covers the top.
Once it has cured, take the clamps off, slide the walls straight out and pull the silicone block off the master. That block is your mold.
Turn the block over and stand it back inside the walls with the clamps on. The opening is the foot of the vase, with the long silicone pin for the test tube standing up in the middle.
Mix a fine concrete or Jesmonite a little wetter than for a slab, pour it slowly down one side so it runs round the pin without bending it, and tap the walls for a minute to raise the air. Fill level with the opening and strike the foot flat.
Leave it to cure for a day, take the walls off, peel the silicone off the sides and pull the vase straight off the pin. Sand the foot flat, add felt pads, seal it and drop in the test tube.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 5 |
| Size (W x D x H) | 78 x 78 x 158 mm |
| Print bed needed | 100 x 78 mm, 158 mm tall |
| Filament | ~392 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 5 printed parts (STL) + bud vase 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.
Standard round-bottom glass test tubes 16 mm across, 100 or 125 mm long. The hole is 17 mm across at the bottom, 90 mm deep and round at the floor like the tube, so a 100 mm tube stands 10 mm proud of the top and a 125 mm one 35 mm. Borosilicate tubes take hot water for cleaning.
Use the test tube for water. Concrete is porous: water in the hole would seep into it, leave a dark ring and, with lime in fresh concrete, harm the stem. The tube keeps the water in glass and lifts out to rinse. A sealed vase can take water for a short while, but the tube is cleaner.
Yes. Fill the tube with water and stand a pothos, monstera or tradescantia cutting in it: the glass shows the roots growing and the concrete keeps the tube upright on a windowsill. Cast two or three and stand them side by side for a small propagation shelf.
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