INDUSTRIAL SAND BINDER JETTING
Patternless Sand Mould and Core Production
Speed3D Mold uses ExOne S-Max® industrial binder jetting technology to produce silica-sand moulds and cores directly from prepared digital data. The process removes conventional pattern-making from the production path while preserving the need for careful casting engineering.
From reverse engineering and simulation to printed sand tooling, casting, and project-specific inspection.
What Does Patternless Casting Mean?
In conventional sand casting, a physical pattern is normally required to form the mould cavity. With sand binder jetting, prepared mould and core geometry is produced directly from digital data. A recoating system spreads controlled layers of sand, and a print system selectively deposits binder in the required areas. The cycle repeats until the complete sand geometry has been formed.
Patternless Does Not Mean Engineering-Free
Eliminating the physical pattern does not eliminate casting engineering. Shrinkage allowance, gating and feeding, core strategy, mould handling, alloy behaviour, pouring conditions, and inspection requirements must still be evaluated for each project.
How Sand Binder Jetting Works
- Step 1
Prepare Digital Geometry
Mould and core data is engineered from an existing component, drawing, scan, or new CAD model.
- Step 2
Slice the Build Data
The prepared geometry is divided into controlled digital layers for printing.
- Step 3
Spread Silica Sand
A controlled layer of silica sand is distributed across the build area.
- Step 4
Selectively Deposit Binder
The print system applies furan-based binder only where each layer must be bonded.
- Step 5
Repeat Layer by Layer
The build platform changes position and the recoating and binding cycle repeats until the geometry is complete.
- Step 6
Recover the Printed Geometry
Unbound sand is removed, revealing the printed sand mould or core for downstream casting preparation.
Unbound sand surrounding the printed geometry provides support during the build. This allows internal passages, curved channels, undercuts, and integrated core features to be produced without conventional core boxes.
Official ExOne process demonstration
Watch 3D Core & Mold Printing on YouTubeThe video shows the general binder jetting principle. Machine configurations shown are not necessarily identical to the S-Max system installed at Speed3D Mold.
Industrial-Scale Sand Printing Capability
Speed3D Mold operates an ExOne S-Max® system configured for large-format production of silica-sand moulds and cores using a furan binder system.
| Specification | Confirmed capability |
|---|---|
| Build Volume | 1,260 litres |
| Build Dimensions | 1,800 × 1,000 × 700 mm |
| Layer Height | 0.2–0.5 mm, depending on material and process settings |
| Dimensional Accuracy | ±0.5 mm, depending on part size and geometry |
| Printing Material | Silica sand |
| Binder System | Furan |
| Technology | Industrial sand binder jetting |
Dimensional accuracy refers to the printed sand mould or core. Final casting tolerances also depend on alloy shrinkage, mould design, pouring conditions, heat treatment, finishing, and machining requirements.
Complex Sand Cores Without Conventional Core Boxes
Binder jetting can produce sand cores with curved passages, internal transitions, undercuts, and integrated features that may require multiple core-box elements or complex assembly when made conventionally. Digital production also allows the geometry to be revised in the source data before another core is printed.
Complex Internal Passages
Produce curved and interconnected sand geometry directly from engineered digital data.
Reduced Core Assembly
Selected geometries may be consolidated, reducing the number of separately manufactured core elements.
Digital Design Revision
Engineering changes can be made in the digital model without modifying a physical core box.
Application in Complex Pump Castings
Pump castings can contain complex flow paths and internal surfaces that are defined by the core system. For replacement components, the required geometry may need to be reconstructed from an existing part, historical drawing, scan data, or a combination of available evidence.
Speed3D Mold connects reverse engineering, casting design, simulation, printed-core production, metal casting, and inspection so that the printing process supports the required casting outcome rather than operating as an isolated manufacturing step.
- Pump impellers
- Pump casings and internal flow passages
- Obsolete or discontinued cast components
- Replacement parts without an existing pattern
- Prototype and design-development castings
- Low-volume castings with complex core requirements
From Digital Data to a Verified Casting
- 01
Existing Component or Drawing
- 02
Reverse Engineering
- 03
Casting and Core Design
- 04
Casting Simulation
- 05
Printed Sand Moulds and Cores
- 06
Metal Casting
- 07
Inspection and Verification
Binder jetting removes the conventional pattern-making step, but it does not remove the need for casting engineering. Speed3D Mold integrates printing with reverse engineering, simulation, mould and core design, casting coordination, and project-specific inspection.
Replacement Casting
Reproducing obsolete or unavailable cast components.
Reverse Engineering
Reconstructing geometry from an existing part or scan data.
Casting Simulation
Filling and solidification review before mould production.
Prototype Casting
First metal parts from a new design for engineering review.
Impeller Components
Component-level engineering notes for cast impellers.
FC300 Impeller Case Study
Printed sand moulds applied to an impeller casting project.
When Should Sand Binder Jetting Be Considered?
Strong Candidates
- Replacement parts without an existing pattern
- Obsolete or discontinued components
- Complex sand cores and internal passages
- Prototype and engineering-development castings
- Low-volume projects where pattern investment may be difficult to justify
- Designs likely to require several digital revisions
- Time-sensitive projects affected by conventional pattern-making lead time
When Conventional Pattern Making May Still Be Suitable
- Stable, simple geometry
- High and repeat production volumes
- Projects with a usable, proven pattern already available
- Parts where the economics of repeated conventional moulding are more favourable
- Applications that do not benefit materially from complex printed core geometry
The appropriate production route depends on geometry, quantity, alloy, required inspection, delivery priorities, and total project economics. Speed3D Mold evaluates these factors before recommending a manufacturing approach.
Read the Full Engineering ComparisonNeed to Reproduce a Complex Casting Without the Original Pattern?
Share the available component, drawing, scan data, material requirement, quantity, and operating conditions. Our engineering team can review whether sand binder jetting is appropriate for the project.
Technical Sources
General binder jetting process information is derived from ExOne’s published S-Max material. Build volume, build dimensions, layer height, dimensional accuracy, sand type, and binder system stated on this page describe the configuration confirmed by Speed3D Mold for its own installed system. All explanatory text on this page is written independently.
Technology Representation
ExOne Sales Representative in Thailand
Speed 3D Mold Co., Ltd. is listed by ExOne as a sales representative in Thailand, supporting local coordination for industrial sand 3D-printing solutions.
Verify our listing on ExOne’s official global support network.
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