A shoe last is a three-dimensional form roughly shaped like a foot, used to design and build footwear. As Shoemakers Academy explains, the last “is the starting point of every shoe design” and even called “the heart of the shoe,” since its shape sets the fit, performance and style of the finished footwear. Lasts have historically been made of carved wood (e.g. beech or maple), injected plastic, or cast metal. In modern practice, materials can include high-density polyethylene (HDPE) plastic and light metals, while recent advances allow 3D-printed plastics as viable alternatives. No matter the method, the last must withstand lasting operations (heating, nailing, stretching, etc.) and precisely define shoe size, silhouette and comfort.
Traditional Last Production
Process Overview: In traditional shoemaking, a last is produced either entirely by hand or with CNC machinery. For example, a custom wood last is hand-carved or turned on a lathe: a shoemaker takes precise foot measurements or a plaster cast, marks those dimensions on a wood block, then mills and sands it into shape over many hours. Alternatively, manufacturers often use plastic blanks: blocks of injected HDPE are computer-turned to final shape on a CNC milling machine. Aluminum or steel blocks can also be CNC-milled for high-volume production, but wood and HDPE remain most common due to cost and weight.
Wood Carving: Traditionally, lasts are “milled from wood, preferably beech,” by taking sole, ball, instep and heel measurements and then machine-turning/sanding the wooden block into shape. Plaster casts of the foot may be filled with foam and sanded as an alternative method. These steps are highly time-consuming and labor-intensive, often taking days of precision work.
Plastic Last Blanks: To speed up production, shoemakers use pre-molded last blanks in HDPE (a #2 recyclable plastic) that approximate a foot’s shape. These blanks are then CNC-machined to final form. While this saves carving time, it still requires skilled CNC programming and hand-finishing.
Finishing: After the basic shape is cut, each last must be sanded, polished and occasionally coated. For wood lasts this avoids splinters and ensures smooth curves; for plastic lasts it removes machining marks. If a multi-part hinged last is needed (for complex shoes), components are fitted with metal hardware.
Materials: Wood (hardwoods like beech) gives a traditional hand-crafted feel and good strength, but is heavy and can warp or split. HDPE plastic is lightweight, durable and can be injection-molded into blanks. Aluminum or zinc-alloy lasts resist moisture and wear but are expensive to machine. (For instance, Shoemakers Academy notes plastic lasts cannot be used in rubber-vulcanizing ovens for soles, while wood is heat-resistant but heavier.) Each material choice affects cost, durability, and compatibility with shoe processes.
Time & Cost: Traditional last making is slow and costly for small runs. Manual carving or CNC setup can take hours to days per last. Skilled labor (hand carvers or CAD/CAM operators) drives up labor cost. Material waste is relatively high: carving wood or plastic results in shavings and scrap. Shoemakers Academy summarizes that wood carving demands “hours of precision work” and is “expensive”. In contrast, once a CNC program is perfected, producing multiple identical lasts is straightforward (favoring larger batch orders).
Tooling: Traditional methods often require custom templates or pantographs. In modern shops, CAD/CAM design files are used, but initial tooling (cutting tools, lathe forms) can add cost. Molded plastics require injection-molding machinery to create the blanks. Overall, setup for a new last shape is significant in time and expense.
3D-Printed Last Production
Workflow: Producing a 3D-printed last begins with creating a digital model of the desired last. This can come from 3D scanning a customer’s foot (or an existing last) or from taking key measurements and using parametric shoe-last software. For example, Amza et al. (2019) describe using a few foot dimensions in a parametric CAD model to generate a custom last, avoiding the need for complex point-cloud scans. Once the CAD model of the last is complete, it is exported (usually as an STL or 3MF file) and processed by a slicing program to generate layer-by-layer instructions.
Technologies: Common 3D printing methods for lasts include:
FDM (Fused Deposition Modeling): Melts and extrudes thermoplastic filament (like PLA, ABS, PETG or TPU) onto the build plate layer by layer. FDM printers are relatively low-cost and widely available. They can use engineering-grade plastics (e.g. TPU for flexibility). However, FDM parts have visible layer lines, and strength is anisotropic (weaker between layers).
SLA/DLP (Vat Polymerization): Uses UV light to cure a liquid photopolymer resin. SLA can achieve very high resolution and smooth surface finish, making it good for detailed last models. Downsides include brittle parts and the need for post-curing. Some specialized resins (like Dreve’s resin) are formulated to resist abrasion and heat.
SLS (Selective Laser Sintering): Fuses powdered nylon or TPU with a laser. SLS produces strong, wear-resistant plastic parts with no support structures needed (the powder itself acts as support). PROTIQ, for example, uses SLS with TPU powder to make orthotic lasts, noting that this yields “significantly higher precision and robustness than … FDM”.
MJF/PolyJet/SLM: HP’s Multi Jet Fusion is similar to SLS and used in footwear for midsoles, but has also been used for lasts. Material Jetting (like PolyJet) jets photopolymers onto the build. Direct metal printing (SLM) is not typical for lasts due to expense and weight, but in theory could make metal lasts.
Materials: A wide range of materials is available for 3D printing. Common plastics include PLA, ABS, PETG, polycarbonate, and flexible TPU/TPE. Engineering filaments (carbon-fiber, nylon) can add strength. SLA resins come in tough, flexible, or high-temperature varieties. SLS typically uses nylon-12 or TPU powders. PROTIQ chose TPU for its elasticity and strength. Some vendors (like Dreve) use light-curing resins in SLA printers, resulting in a rigid, durable last. Importantly, each material has different heat resistance: many 3D-printed polymers cannot withstand high heat or prolonged UV exposure, so choice of material must match the shoe-building process (e.g. thermoforming).
Production: Once printing begins, the process is largely automated. Print times vary by technology and size: a last-sized print can take several hours (e.g. 8–24 hours on an FDM or SLS machine). After printing, post-processing is needed: removing supports (if FDM/SLA), cleaning/resin-washing (if SLA), and curing (SLA). SLS parts often require bead-blasting or dyeing to remove powder. Finally, the part is sanded and possibly sealed or painted for a smooth finish. Compared to hand-crafting, the human labor is mostly in setup and finishing, not in the bulk of material removal.
Traditional vs 3D-Printed Lasts: Comparison
The two methods differ in many dimensions. The table below summarizes key aspects:
| Aspect | Traditional Lasts | 3D-Printed Lasts |
|---|---|---|
| Materials | Wood (beech/maple), HDPE plastic, aluminum | Thermoplastic filaments (PLA, ABS, TPU), photopolymers (resins), nylon powders |
| Production Process | Manual carving or CNC milling of a solid block; or foam casting | CAD/CAM design → slicing → layer-by-layer printing |
| Precision | Very high (CNC machining can achieve sub-millimeter accuracy) | Very high for SLA/SLS (smooth, complex shapes); moderate for FDM (visible layers). SLS with TPU yields “significantly higher precision” than FDM. |
| Customization | Custom shapes require new carving or master; slow and expensive for one-offs | Easily customize each last in CAD; digital files can be reprinted or adjusted instantly. |
| Production Speed | Long setup: hours–days per last (especially for unique designs) | Setup fast: once CAD is done, printing takes hours to complete; minimal operator time. |
| Cost Efficiency | High labor and tooling cost; economical only in larger batches | Lower initial setup; cost-effective for small runs and prototypes. Machines and materials have upfront cost, but no custom tooling needed. |
| Scalability | Efficient for large-volume (repeat) production; uniform batches easy with CNC | Best for low-volume or one-off; scaling to mass production requires many printers/time |
| Material Options | Limited to traditional last materials (wood, HDPE, metals) | Very wide: engineering plastics, rubbers, composite materials; new materials emerging |
| Durability & Use | Highly durable; wood/metal tolerate heat and mechanical wear. | Depends on material: SLS nylon/TPU is very robust, while some resins or filaments (PLA) are weaker. Studies show properly printed lasts can match durability of wood. |
Real-World Use Cases
Several footwear and orthotic manufacturers have begun using 3D-printed lasts:
Academic/Prototype Study: Amza et al. (2019) demonstrated FDM-printed TPU lasts used to manufacture bespoke canvas shoes. They report the printed lasts “withstood typical process loads and high temperatures” during production, validating their practical durability.
Podohub (USA): A direct-to-consumer shoe last maker that offers custom CNC and 3D-printed lasts. Podohub notes that traditional lasts are “CNC machined out of HDPE,” whereas their 3D-printed lasts use a harder polyethylene and are hollow (reducing weight). In use, the printed lasts held nails well and “have proven to hold up under common footwear manufacturing methods”. The hollow design also makes them lighter and cheaper to ship.
PROTIQ (Germany): An engineering 3D-printing service for orthopedics. PROTIQ uses SLS printers with a specially tuned TPU powder to make custom orthopedic lasts. According to PROTIQ, 3D printing can “reduce dramatically” the weeks-long lead time of custom lasts. They highlight that SLS-TPU lasts have excellent strength and temperature resistance, and even allow large lasts (two-part, three-part) to be printed in one piece.
Dreve (Germany): A medical footwear company offering 3D-printed last kits for orthotics. Dreve emphasizes that its photopolymer resin lasts have an internal honeycomb structure for high strength under pressure. They report these 3D-printed lasts perform “just as reliably as a traditionally manufactured last,” while being quicker to deliver thanks to their digital workflow. Dreve also notes that staples and nails can be used normally on their printed lasts without damage.
Industry Innovators: While large athletic brands (Nike, Adidas, etc.) currently focus 3D printing on midsoles and prototyping, many bespoke shoemakers are adopting digital lasts. For example, some luxury and custom shoe workshops use desktop FDM printers to iterate designs rapidly. Software tools are emerging (e.g. 3D shoemaker CAD plugins) to streamline digital last design for high-end designers.
Challenges and Limitations of 3D Printing
Despite its advantages, 3D printing has some limitations in last-making:
Print Time & Throughput: Large lasts require many hours to print. Producing dozens of lasts with a single printer is slow, so 3D printing is not yet practical for very high-volume mass production without multiple machines.
Material Constraints: Some 3D-printable plastics have lower heat deflection than wood or metal. For instance, PLA or basic ABS may deform in hot lasting ovens. PROTIQ and Dreve mitigate this by using advanced TPU or high-temp resins, but cheap filament prints might not hold up under all shoe-factory conditions. Moisture absorption can also be a concern: whereas high-end resin and nylon parts remain stable, generic nylon prints may swell or lose tolerance over time.
Surface Finish: FDM prints exhibit visible layer lines and may require significant sanding or vapor smoothing to achieve a smooth last surface. SLA and SLS provide finer detail, but SLA parts are usually smaller (limited build size) and SLS parts have a slightly gritty surface that may need finishing.
Strength Anisotropy: Layered prints are generally weaker along the layer planes. SLS and SLA parts are usually isotropic enough for lasts, but FDM parts must be oriented and infilled carefully to avoid weak planes. PROTIQ notes their SLS-TPU lasts have superior robustness, hinting that basic FDM might not always meet the same standard.
Cost of Equipment and Materials: Industrial 3D printers (especially SLS/SLA) are expensive, as are engineering materials. While small runs avoid molding costs, the per-unit cost of a printed last can be higher than a mass-produced plastic last once volumes grow.
Skill and File Prep: Shoemakers must adopt CAD skills or scanning equipment. Cleaning up scan data or fine-tuning parametric models still requires expertise. Mistakes in modeling or slicing can cause print failures.
Regulatory and Quality Assurance: In medical/orthotic applications, printed lasts must be validated to ensure patient safety and consistency. This adds process overhead, though companies like Dreve and PROTIQ handle certification.
Integration with Workflows: Some legacy processes (e.g. dipping lasts in wax, high-temp molding steps) were developed for traditional materials. Workshops need to ensure new lasts integrate smoothly (e.g. selecting a resin that tolerates vacuum-thermoforming, or using nickel or specialized heels anchors for 3D-printed lasts).
Expert Recommendations
Assess Your Needs: For custom or prototyping runs, 3D printing is often faster and cheaper than hand-sculpting a new last. For large production runs, traditional CNC may still be more economical per piece. Use 3D printing to accelerate design iterations and offer personalized fits (one-off or small batches), and consider traditional methods when millions of identical lasts are needed.
Choose the Right Technology: Use SLS or high-end FDM (with TPU or nylon) if you need the last to be highly durable and heat-resistant. SLA resins can work for dress shoes or samples where surface finish is critical, but ensure the resin can handle sanding and lasting processes. In general, HP/MJF or SLS of TPU/nylon yields robust lasts that survive nailing, grinding and thermoforming without damage.
Leverage Digital Workflows: Invest in foot scanning and CAD expertise. Having a digital last library means each model is reproducible and adjustable. Digital workflows (scan → CAD → print) can dramatically shorten lead times. For example, PROTIQ and Dreve report that digital scanning + printing allows last delivery in days instead of weeks.
Perform Validation: Always test the printed last under real use conditions. As Amza et al. showed, 3D-printed lasts can work in actual shoe assembly, but you should verify nail-pull strength, heat tolerance, and wear in your own processes. Use trial shoes and inspect lasted shoes carefully.
Optimize Design: Take advantage of 3D printing’s design freedom. Add internal lattices or hollow sections to reduce material and weight (Dreve’s lasts use honeycomb cores for strength). Incorporate standardized metal inserts or hinge joints during CAD modeling for easy assembly, as some providers do.
Consider Hybrid Approaches: One strategy is to 3D-print a master last and then use it to create a silicone or aluminum mold for rapid duplicate production. This can combine the customization of 3D printing with the fast turn-out of casting for moderate volumes.
Work with Experts: If new to this, partner with specialists. Companies like PROTIQ or Dreve (medical) or Podohub (footwear) can print lasts on demand. Outsourcing a few prints is a low-risk way to evaluate the process before investing in hardware.
In summary, 3D printing is not a wholesale replacement for traditional last-making, but it expands capabilities. It excels at rapid custom design, iteration and personalization. When used appropriately (choosing suitable materials and printers), 3D-printed lasts can “perform just as reliably as a traditionally manufactured last,” while delivering them “on short notice” via a fully digital workflow. Footwear designers and manufacturers should weigh these trade-offs: embrace 3D printing for agility and customization, but retain traditional methods (or molds) when scale and material requirements demand it.