How can 3D printing be used in series production?

Technical article by Niko Mroncz, Head of Sales Engineering Xometry Europe

3D printing is transforming the manufacturing industry. It is no longer used only for prototypes. Printed series production is becoming established in sectors such as medical technology (hearing aids), aerospace (fuel nozzles) and consumer goods (sports shoes). The number of applications is growing, and more and more developers are asking themselves: what could we also print in series?

In practice, a clear trend is emerging. 3D printing is unlikely to replace injection molding or CNC machining. However, additive manufacturing can usefully complement traditional technologies. 3D printing is an excellent option when agility, adaptability or geometric freedom are important.

Below, we analyze concrete benefits that engineers and companies can gain from using printed series. The positive effects of 3D printing can be further enhanced when companies combine their product development with state-of-the-art procurement methods. We offer this possibility on our manufacturing platform Xometry. Here, developers upload their CAD files and select material, printing process and quantity. The platform then uses AI to assign the order to a suitable manufacturer. No supplier search, no lengthy RFQs, no delays. This is ideal for getting started with 3D printing. But even later, modern engineers use this approach to combine fast development with speed in implementation, securing agility, flexibility and cost efficiency.

There are many good reasons to print parts in series. Some standard situations in everyday engineering where additive processes are a good fit:

• Injection molding cannot be justified with the available budget or the required quantity.
• Functional parts for an end-use application are needed in less than ten days.
• A design is still under development, and customized batches are therefore to be offered in series.
• The parts contain complex features such as lattice structures, undercuts or internal channels.
• Hinges, joints or snap-fits can be integrated directly into the component.
• Inventory costs are to be reduced through demand-driven production.

The concrete benefits gained from printed series differ by industry and application. The transition from prototyping to series production also requires specific design and process adjustments. As a rule, however: 3D printing brings speed and flexibility to processes. The various technologies are not equally suitable for every use case. An overview of the different additive processes and their applications can be found here.

1. Fast prototypes enable faster development

Whether the goal is innovation or refining existing products: less lead time means faster time to market. 3D printing reduces lead times even for pilot runs or bridge production.

For quantities up to a thousand units, printing can drastically shorten development time. Lead time for injection molding is typically four to eight weeks. For CNC machining, you still have to allow up to three weeks. In the printed MJF process, however, parts are available within one week – because no toolmaking is required.

This makes it possible to quickly realize functional parts for demonstrations, pilot trials or trade shows. Pre-sales of small series are also possible while tooling is still in development.

2. Design flexibility without tooling constraints

With 3D printing, the limitations associated with tooling disappear. Suddenly, complex geometries become feasible, such as undercuts and internal channels for airflow, cooling or fluid transport. In aerospace and electronics, for example, cooling channels are printed directly into components to significantly improve thermal management.

Lattice structures also reduce a part’s weight while maintaining structural integrity. This is particularly important in vehicle construction or medical applications, where the performance-to-weight ratio is critical. Printed lattice structures are used in sports helmets or insoles to absorb energy or provide cushioning.

Likewise, complex and organic shapes such as free-form or topology-optimized geometries are possible that are difficult or impossible to manufacture by CNC or casting. This allows engineers to prioritize performance in development before worrying about manufacturability.

3. Integrated assemblies such as snap-fits

3D printing allows the production of fully functional, multi-part assemblies in a single build. This eliminates fasteners, adhesives and manual assembly steps. Snap-fits made from flexible materials such as PA12, PA11 or TPU can be integrated, ideal for covers or housings that are frequently opened or replaced. Living hinges can be printed as integral features from ductile thermoplastics such as polypropylene-like resins or flexible nylon, for flaps or lids. This is useful for packaging, containers or access panels.

4. Simple design changes

Design changes in injection molding quickly cost four figures and take up to three weeks. In 3D printing, the change is complete once the CAD file is saved. This is especially valuable for consumer products with evolving designs. Rapid iterations lead to improved usability and faster market launch. This also proves effective for manufacturing customized parts such as wearables, medical devices or enclosures for electronic equipment.

In serial 3D printing, version control and agile product development also become realistic. Instead of producing the same part for months, designers revise their design every 200 to 300 units, incorporating collected feedback.

5. Reduced inventory costs through on-demand production

With 3D printing, only what is actually needed is produced. This eliminates high inventory costs that are common in traditional manufacturing methods.

Injection molding is only truly economical at quantities above 10,000 units, which often leads to overproduction. In contrast, 3D printing supports distributed just-in-time manufacturing.