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What is sand 3D printing?
Sand 3D printing, also called binder jetting, builds a piece from thin layers of fine sand, bound by a liquid binder only where the piece exists. There are no moulds and no tooling. Foundries use it to print casting moulds. We use it to make the piece itself, in black quartz sand, up to 1800 × 1000 × 700 mm in one print.
Sand 3D printing is binder jetting with sand. A printer spreads a thin layer of fine sand across a build box. A print head, much like an inkjet, then lays down a liquid binder only where the piece exists. Another layer of sand goes down on top, and the head prints the next slice. When the print is finished, the piece sits inside a block of loose sand. Lift it out, clear the loose sand away, and the form is there.
Binder jetting is one of the seven process categories named in ISO/ASTM 52900, the international vocabulary standard for additive manufacturing. It grew out of research at MIT in the late 1980s, patented as "three-dimensional printing" in 1993. Today it is how foundries print sand moulds and cores for metal casting: complex shapes, no wooden patterns, no tooling. At Blacksand the same technology makes the finished piece.
How a piece is printed
- Spread. A thin layer of black quartz sand, around 0.28 mm, is laid flat across the build box.
- Print. The head draws one slice of the piece. Sand outside the slice stays loose and holds everything in place.
- Resin. Once the print is out, resin soaks into the printed form and hardens it. Raw, printed sand snaps. With resin, it holds.
- Finish. The loose sand is brushed off and the surface is finished by hand. The loose sand goes back into stock for the next print.
What it does well
- Size. One print fills up to 1800 × 1000 × 700 mm. A dining table, a console or a lounge chair can come out of the printer in one piece. Anything bigger is printed in parts and bonded.
- Complex form at no extra cost. Lattices, undercuts, hollows and internal channels print in the same time as a plain block. The price follows weight, not difficulty, so a lattice often costs less than a solid shape.
- No moulds, no minimum. With no tooling, one piece and a full series start the same way. There is no minimum order.
- Built-in details. Cable channels, fixing points for wall pieces, pegs, sockets and lids are drawn into the file and printed with the piece.
- Many pieces in one print. Loose sand supports parts at every height, so one print can carry a floor lamp and fill the space around it with vases.
What it is not made for
- Small mechanical parts.
- Mirror-polished surfaces.
- Very thin walls. Walls of 5 mm or more print as drawn.
- Food or drink. Pieces are for indoor use and are kept dry, unless a product page says otherwise.
What a printed piece looks and feels like
The surface is the material itself: matt, mineral and light-absorbing, with no paint or coating. Look closely and you see the grain, small pores and slight shifts in tone and sheen. Sand is fine enough that curves read smooth rather than stepped.
It is heavy in the hand. The material is dense, so it is slow to warm and slow to cool, and a shaped panel even changes how a room sounds. Raw, the sand takes water in. Sealed, water beads and wipes off, which is why pieces that will meet water are sealed.
Sand 3D printing compared with other ways to make a piece
| Sand 3D printing | Plastic 3D printing (FDM) | Casting | Carving | |
|---|---|---|---|---|
| Moulds or tooling | None | None | One mould per shape | None |
| Surface | Matt, mineral, the material itself | Visible lines, plastic | Set by the mould | Tool marks or polish |
| Hollows and inner channels | Yes | Yes, with supports | Difficult | Very difficult |
| One piece vs a series | Same rate per kg | Low cost per piece | Mould cost spread over many | Hours per piece |
| Typical use at furniture scale | Tables, seating, lighting, objects | Prototypes, small parts | Concrete, resin, metal | Stone, wood |
What it costs
At Blacksand every piece is priced by weight, at one rate for every designer: €158 per kilogram, including VAT. There are no setup fees and no tooling costs. Some real examples from the Sand Store:
- A 0.53 kg candle holder: about €84.
- A 2.3 kg vase: about €363.
- A 32.7 kg coffee table: about €5,160.
Fitted parts such as glass tops, lighting kits or wall fixings are added at their own listed price. Read the full breakdown in How much does sand 3D printing cost?
Who uses it
Foundries have used sand printing for years to make moulds and cores for metal parts. In design it is newer. At Blacksand, a collective of designers from cities across Europe and beyond uses it for side tables, consoles, coffee tables, lighting, vases, candle holders, clocks and sculpture, all in the same black quartz sand. Architects and interior designers use it for pieces made to a project, from a single object to a whole room in one material.
See the Sand Store for pieces you can order, or Production to have your own design printed.
Questions
Is sand 3D printing the same as binder jetting?
Yes. Binder jetting is the name of the process. Sand 3D printing is binder jetting with sand as the powder.
How big can a sand 3D printed piece be?
At Blacksand, one print fills 1800 × 1000 × 700 mm. Larger pieces are printed in parts and bonded.
Is a sand 3D printed piece strong?
Raw printed sand is fragile. After resin infiltration it is a solid, dense piece, printed solid all the way through unless it is designed hollow. Delicate parts print inside a protective cage that is cut away after.
What files can be printed?
A 3D file in STEP, OBJ, STL or 3DM, or a sketch with dimensions. Every file goes through a design review before it prints.
What colour is it?
Every Blacksand piece is black quartz sand. The colour is the material itself, not a coating.
How long does it take?
Most pieces are ready in 4-6 weeks, from file check to delivery.
Sources: ISO/ASTM 52900 vocabulary standard · US patent 5,204,055, three-dimensional printing techniques (1993) · MIT Mechanical Engineering
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