◆ Concrete
Concrete bird bath mold
A 150 mm tabletop bird bath to cast in concrete: a wide rim to perch on and a shallow basin. A silicone mold kit from printed parts.
◆ Concrete
A 150 mm tabletop bird bath to cast in concrete: a wide rim to perch on and a shallow basin. A silicone mold kit from printed parts.
A small concrete bird bath 150 mm across and 34 mm tall on a 104 mm foot. A flat 12 mm rim runs all the way round for birds to land on, and inside it the basin slopes gently to 22 mm deep in the middle: the shallow water small birds bathe and drink in. No hole, it holds water.
Made with the box mode of our silicone mold maker, which the tool itself suggests for this low, wide shape. Print the base with the bird bath fused onto it, the two walls and the two clamps, and pour about 1060 ml of silicone. It fills the basin and becomes the core, so every cast comes out with its dish already formed.
The rim is wider than the foot, so the cured block gets one straight slit to let each cast out. Set it on a garden table, a wall or a tree stump, or cast a few as gifts: raw concrete weathers to a soft grey outdoors. The zip carries every printed part, the 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 1130 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 bird bath 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 bird bath, 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 bird bath off the core. Sand the foot flat and seal it.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 5 |
| Size (W x D x H) | 177 x 177 x 72 mm |
| Print bed needed | 200 x 178 mm, 72 mm tall |
| Filament | ~467 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 5 printed parts (STL) + bird bath master (STL) + print sheet + recipe |
| Added | 2026-09-30 |
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.
Yes, once it has cured and the alkali has washed out. Leave the cast for a week, then soak it in water for a few days, changing the water daily, before birds use it. Do not seal the inside with a varnish or paint: a raw concrete basin gives birds a better grip than a glossy one.
Shallow: 2 to 4 cm in the middle and sloping up to the edge, so small birds can wade in. This one is 22 mm at the deepest point, and the flat rim gives them somewhere to land first. Add a flat stone in the middle for the smallest birds.
Tip out the water and refill it every day or two in summer, and scrub it with a stiff brush and plain water once a week so algae cannot take hold. Avoid soap and bleach. Set it in partial shade: the water stays cooler and grows less algae.
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