Concrete Casting
Scaling Precast: 120 Complex Molds Delivered in 5 Days
How 3D printed PLA tooling reduced precast mold production costs by up to 77% while easily withstanding the pressure of poured concrete.
Creating custom concrete casting molds for complex shapes can be costly and labour-intensive, particularly when traditional tooling methods struggle to reproduce sweeping or intricate geometries efficiently. In the refractory industry, 3D printing provides a flexible way to produce detailed concrete molds quickly and economically, while also making it easier to scale production for larger orders. This approach can reduce the time and cost involved in producing specialized molds while maintaining the precision and consistency needed for repeatable concrete casting.
Technology
FDM (Fused Deposition Modeling)
Material
Polylactic Acid (PLA)
Size
88 × 79 × 46 mm
THE CHALLENGE
Producing 120 custom molds for a complex precast concrete spiral presented a significant production challenge. Traditional wood tooling would have been costly and labour-intensive to produce at this volume, while the client’s two in-house 3D printers could not manufacture the molds quickly enough to meet the required timeline. The limited production capacity would have turned a relatively straightforward mold order into a weeks-long bottleneck, delaying the concrete casting process and increasing the overall cost of the project.
What we did
Prepared the Spiral Mold Design: Developed the complex spiral geometry as a printable mold design, ensuring each component was suitable for concrete casting and repeatable production.
Scaled Production Across Our Print Farm: Moved production beyond the client’s two in-house printers by running multiple FDM machines in parallel, allowing 120 molds to be produced efficiently.
Selected PLA for Reliable Casting: Used rigid PLA to withstand the pressure of poured concrete while providing a suitable surface for clean demolding with standard mold-release techniques.
Delivered 120 Molds in Five Days: Removed support structures and prepared each mold for concrete casting, completing the full batch in just five days and keeping the client’s concrete production on schedule.
why it worked
FDM printing with PLA provided the combination of rigidity, durability, and cost efficiency required for the concrete casting molds. PLA was strong enough to maintain its shape under the weight and pressure of poured concrete, allowing each mold to withstand the casting process without deforming. It also provided a reliable release when used with a standard mold-release agent, allowing cured concrete to be removed cleanly while preserving the shape and surface quality of each cast.
Our production approach significantly reduced both cost and lead time. Rather than relying on the client’s two in-house printers, we used multiple FDM machines in parallel to manufacture all 120 molds. By leveraging our printer fleet, we completed the molds in five days compared with the several weeks that would have been required using the client’s existing production capacity. This approach achieved a 55% to 77.5% cost reduction compared with traditional wood tooling, which can become costly when producing complex geometries such as spirals. The intricate curves and contours of these shapes can require extensive carving or milling, making them more labour-intensive and time-consuming to produce using conventional subtractive methods.
For custom precast and refractory industry applications, 3D printing provides an efficient and cost-effective method for producing complex concrete molds at production volumes that may be impractical with limited in-house manufacturing capacity.
Where a model like this fits
3D-printed concrete molds are well suited to custom precast, refractory, architectural, and industrial applications where complex geometries are difficult or expensive to produce using conventional tooling. The approach is particularly valuable for specialized components and production runs requiring multiple identical molds within a short timeframe. From concrete casting molds and refractory tooling to architectural features and custom precast components, 3D printing provides the flexibility to produce intricate geometries while reducing tooling costs and production time.
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