Silicone 3D Printing: Can Real Silicone Be Printed?

Stratasys P3™ (DLP) technology, developed in collaboration with Shin-Etsu, enables true tool-free silicone 3D printing with thermal, chemical and mechanical properties equivalent to traditional silicone. The solution overcomes the challenges of viscosity, curing, and deformation, resulting in durable, repeatable parts for automotive, aerospace, industrial and consumer applications. Accelerated aging tests show improved stability compared to alternative solutions, providing a breakthrough for seals, glands, wearables and custom tooling.

When designing a part that needs to seal, bend, deform flexibly, and withstand harsh environments, silicone is often the first choice. However, manufacturing custom silicone parts typically involves long lead times, expensive tooling, and limited development flexibility. This can easily become a bottleneck when you’re on tight deadlines.

Silicone 3D printing offers a useful alternative: tool-free manufacturing allows for the creation of functional, performance-grade silicone parts while maintaining the freedom to test, fine-tune, and manufacture on demand.

This post will take a detailed look at how the process works, why printing silicone is a challenge, and where it brings the greatest benefit – from automotive to industrial uses to other areas.

What is silicone and how can it be 3D printed?

Material properties of silicone

Silicone is an elastomer known for its unique combination of properties, including:

Unlike many thermoplastics or rubbers, silicone can be stretched and compressed without permanent deformation, even after prolonged exposure to extreme temperatures or aggressive chemicals.
These properties make silicone ideal for the manufacture of gaskets, seals, covers, dampers and protective parts in automotive and industrial applications. For many engineers, it is critical to be able to use real silicone (and not “silicone-like” substitutes) when parts must withstand heat, pressure or chemicals for long periods of time.

Although silicone injection molding/casting is a long-established and mature process, 3D printing silicone has been a major challenge in the past.

The challenges of 3D printing silicone

Due to the low viscosity and non-thermoplastic nature of silicone, it is fundamentally incompatible with most additive manufacturing processes.

FDM: For example, FDM systems are based on melting and extruding thermoplastics, which solidify when cooled: this process does not work for silicone, which does not melt in the same way.

SLA and other vat photopolymerization techniques: these require UV-curable substrates that solidify rapidly when exposed to light. Silicone, on the other hand, does not harden in this way without chemical modification, and such modification often degrades the basic properties of the silicone.

Deformation during printing and post-processing:
Because silicone is soft and flexible even in its final state, printed parts can easily deform during both the printing and post-processing phases — especially if part support and curing conditions are not carefully controlled.

Process control and dimensional accuracy:
even though printable chemical systems exist, low viscosity silicones tend to flow/spread before curing. This makes it difficult to maintain dimensional accuracy, define layers clearly, and achieve excellent surface quality.

Silicone 3D Printing with P3™ DLP

Stratasys' approach to silicone printing combines advanced materials with a platform that delivers accurate and consistent manufacturing: Origin® P3™ DLP (Digital Light Processing).

The real breakthrough is in the material composition. Developed exclusively by Shin-Etsu (a global leader in silicone chemistry), “P3™ Silicone 25A” is real silicone – not a “silicone-like” imitation. Its silicon-oxygen backbone provides the same chemical and mechanical properties as cast silicone: flexibility, durability, chemical resistance and long-term thermal stability.

However, printing such a material still requires a high level of process control – especially to capture fine details and ensure surface quality. Which raises the question:

Why 3D print silicone?

Silicone is a unique material that combines several properties that rarely occur together. 3D printing, as a process, offers several advantages over traditional manufacturing. Let's first look at the material advantages of silicone.

Material advantages of silicone

Flexibility and Elasticity
Silicone's molecular structure provides exceptional flexibility and elastic recovery. It can bend, stretch, compress and spring back without breaking or losing shape, making it ideal for any application where dynamic movement is expected. It retains its shape and performance even after repeated use, which distinguishes it from thermoplastic elastomers (TPE).

Heat resistance / thermal stability
Silicone operates reliably over a wide temperature range, with excellent mechanical and chemical stability. It remains flexible at low temperatures, while not softening excessively at high temperatures, making it particularly suitable for seals. This heat resistance is a great value in the automotive, aerospace and industrial environments where components are subjected to thermal cycling or continuous heat stress.

Chemical and environmental resistance
Silicone has outstanding resistance to many rubbers and plastics:

This makes it ideal for outdoor use, harsh process environments, and situations where it comes into contact with fluids.
Common applications include seals, glands, O-rings, protective covers – wherever resistance to chemicals, oils, or weather is a basic requirement.

Durability and mechanical strength
Despite its soft structure, silicone is known for its excellent tear resistance, dimensional stability and fatigue resistance under both static and dynamic loads. It does not become brittle over time and can withstand pressure or repeated bending, even with a thin cross-section. This makes it an excellent choice for a wide range of applications.

Biocompatibility
Silicone can be formulated to meet biocompatibility standards, such as cytotoxicity. This makes silicone a reliable material for skin-contact applications, such as consumer wearables and medical devices.

Advantages of silicone 3D printing

When it comes to manufacturing silicone parts, additive manufacturing offers several advantages over traditional methods. In particular, speed, efficiency, and design freedom make 3D printing useful for tooling and small-scale silicone production.

No tools required

Silicone parts are typically produced using injection molding inserts or compression molds, which are time-consuming and expensive to make — especially for small quantities, customization, or pilot runs.

With 3D printing, parts can be manufactured directly from a CAD model, eliminating the need for hard tools.

What does this mean to you?

Silicone casting has inherent limitations: undercuts, thin walls, internal channels often require complex tooling, parting planes, or multi-step manufacturing. 3D printing largely overcomes these limitations, allowing engineers to:

The result: new design possibilities for elastomeric parts, where the shape is optimized for performance, not tailored to manufacturability constraints.

Small batch production

For companies that produce a few hundred or a few thousand parts, traditional silicone manufacturing methods often do not strike the optimal balance of price, time, and flexibility. Silicone 3D printing offers a viable alternative when the volume does not justify injection molding.

Cost-effective in small series – avoids the cost/part “jump” of small-volume tooling and the additional cost of form iterations.

Short-run customization – multiple design variations or customer-specific geometry can be produced in a single print run.

This makes 3D printing ideal for bridge production, pilot programs, and market tests: teams can go from prototype to product without the bottlenecks of traditional manufacturing.

Customization and personalization

One of the strongest advantages of silicone 3D printing is the ability to produce customized parts. Since there is no need for a mold or custom tooling, each print can be unique, without extra cost or delay.
This is especially valuable where comfort, fit, or patient-specific needs matter:

Wearable devices: straps, grips, and covers can be adjusted to the contour of the user's wrist/palm, improving comfort and performance.
Medical devices: patient-specific seals, soft-touch components, and biocompatible interfaces can be manufactured on demand, enabling better results and faster adaptation to clinical requirements.
Consumer goods: brands can offer customized ergonomics, aesthetics, or functional features at scale, without the overhead of traditional manufacturing.

By removing the limitations of tooling, silicone 3D printing enables true mass customization: serving a single patient, a test market, or even an entire product range built on individual fit and feel.

Material efficiency and sustainability

Additive manufacturing inherently produces less waste than machining or molding. Silicone is only used where it is needed, with minimal waste.

Additional benefits include:

For organizations striving for lean operations or sustainability goals, 3D printing offers a cleaner, more responsive way to manufacture silicone parts.

Applications by industry

Automotive industry: heat-resistant, flame-resistant (FR) silicone parts

Automotive components often operate in harsh, high-temperature environments (engine bays, chassis areas). Silicone's natural heat resistance is well suited to these needs, where thermal stability is not a trade-off.

Typical applications:

Another advantage of additive manufacturing is that we only print what is needed – no large, expensive molds, no stockpiling of spare parts. This is especially valuable for aftermarket parts or flexible production with variable quantities.

With 3D printed silicone parts now offering true FR capabilities, automotive engineers have a material option that meets both design and regulatory performance requirements.

Aerospace and rail industry: flame-retardant, FST-compatible components

In the aerospace, rail and other transportation industries, materials must meet stringent FST (flame, smoke, toxicity) specifications while maintaining mechanical performance. Silicone’s natural heat resistance and chemical stability, complemented by newly available flame retardant (FR) formulations, make it an ideal choice in these areas.

Additive manufacturing allows airline and rail operators to produce certifiable parts on demand, reduce inventory levels of slow-moving spare parts, and quickly implement fleet-specific modifications – all while meeting FST requirements.

Industrial sector: durable components

In manufacturing, energy and heavy industry (e.g. oil and gas), elastomer components often operate in chemically aggressive or mechanically demanding environments.
Silicone is an ideal candidate for the following applications:

Silicone's resistance to UV, ozone, solvents and temperature fluctuations gives it a longer lifespan compared to many alternative materials.

Consumer products: rapid customization and ergonomic design

In the world of personal care and wearable technology, manufacturers favor silicone for its soft touch, skin-friendly behavior, and visual versatility. When 3D printed, it becomes an especially powerful tool:

Additively manufactured silicone allows for faster adaptation of shapes, sizes or aesthetics without the need for any tooling investment. And if the silicone is biocompatible, it also allows for skin-contact or comfort-oriented designs.

For engineers and manufacturing teams, 3D printed silicone offers a rare combination of creativity, comfort, and performance – all in a single material and manufacturing strategy.

Overcoming the challenges of silicone 3D printing

Silicone is not easy to print – which is why the “P3 Silicone 25A” material is such a breakthrough. The softness, flow behavior and curing requirements present unique challenges that have made true silicone – and many other elastomers – historically incompatible with additive manufacturing.

Below we review why silicone is difficult and how Stratasys addresses these.

Material efficiency and sustainability

Soft silicones often have low viscosity and can unexpectedly flow/spread after deposition. This makes it difficult to position the material precisely, especially for thin walls or fine details. Without careful control, the result is poor dimensional accuracy and a blurry layer image.

Stratasys Solution:
The P3 DLP printing process uses precise light control and mechanical actuation to control flow and cure timing, ensuring a stable build layer by layer.

The silicone formula itself was developed by Stratasys in collaboration with Shin-Etsu (a global leader in silicone chemistry since 1926). The “P3 Silicone 25A” base material has been tuned to provide an optimal balance between fluidity and stability – allowing for clean printing without premature sagging or spreading.

Accuracy and surface quality

Soft materials can deform during printing, which affects tolerances and surface quality. A poor surface is not just an aesthetic issue: it affects sealing, friction, and performance.

Stratasys Solution:
P3 technology provides high resolution and a smooth surface that approximates the quality of cast parts.

Closed-loop process control reduces variation between pieces, thus providing repeatability – especially important in R&D and small-batch production.

Cost and post-processing

Silicone requires careful curing to achieve its final mechanical properties. Uneven or incomplete curing can lead to soft spots or reduced durability. However, silicone can also be “over-cured.” If cured for too long, it can increase the Shore value and make the rubber harder than the desired softness level.

The Origin printer measures and controls printing parameters to maintain optimal conditions.

Post-treatment takes place under controlled conditions: 85 °C and 85% relative humidity, specifically optimized for this silicone chemistry.

By combining material and process control, Stratasys makes reliable silicone 3D printing accessible to engineers who previously had no alternative to molded parts. Whether prototyping or producing small batches of functional elastomer components, the combination of material integrity and print accuracy makes a measurable difference.

Stratasys Silicone 3D Printing Technologies

P3 DLP technology

At the heart of Stratasys’ silicone printing solution is P3 DLP (digital light processing) – a tightly controlled photopolymerization process that delivers high detail, superior surface quality and repeatable dimensional accuracy. Unlike open DLP platforms, P3 technology uses closed-loop light intensity and mechanical control to achieve consistent part quality, even when working with challenging materials like elastomers.

The process produces precise parts and surfaces that approach the quality of injection molded parts. Its reliability and accuracy make it ideal for manufacturing aids and small/medium series production where traditional molding would be too expensive or slow.

The difference in material: real silicone, not a substitute.

The Origin equipment, 3D printing process, and raw material combine to produce top-quality silicone parts. What truly sets Stratasys apart is the complete manufacturing system that is perfectly tuned to ensure user success.

“P3 Silicone 25A”, developed in collaboration with Shin-Etsu, is a true silicone, not a “silicone-like” elastomer. Its silicon-oxygen backbone provides the expected thermal, mechanical and chemical properties of traditional silicone rubber. These include:

When choosing a silicone material, it is important that the material (and the part) maintains the characteristic behavior of silicone over the long term. Check the performance data, especially the aging tests. Unlike thermoplastic or thermoset elastomers, silicones are designed to maintain their properties over the long term, even after prolonged exposure to high temperatures. Stratasys’ solution delivers the long-term performance you expect – especially in demanding automotive, industrial, and consumer applications.

Cost and post-processing

The Origin printer measures and controls printing parameters to maintain optimal conditions.

Post-treatment takes place under controlled conditions: 85 °C and 85% relative humidity, specifically optimized for this silicone chemistry.

Silicone performance comparison

1000 hour aging test at 150 °C

Functional, designed for small series production

Many silicone parts are inherently low-volume. Injection molding of custom seals, tool handles, or product-specific glands is often too expensive, especially in the early development phase or for short runs.

Stratasys' solution enables manufacturers to:

This platform is ideal for production applications where silicone is required and there is a high variation, as it flexibly, economically and reliably supports small-volume functional manufacturing.

Conclusion

P3™ Silicone 25A delivers all the properties engineers expect from true silicone: mechanical performance, wide operating temperature range, regulatory compliance, and the quality of injection molding. This allows you to create parts that rival molded counterparts in flexibility, heat and chemical resistance, durability, and conformability—without the lead time, tooling costs, and design constraints of traditional manufacturing.

This means you can produce silicone parts in small runs or individual batches, while each piece behaves like its molded counterpart. From seals and glands to ergonomic, wearable elements, you can achieve precise fit, consistent quality, and reliable, long-term performance — with the speed, flexibility, and design freedom of additive manufacturing.

Furthermore, the material also provides regulatory compliance across a range of industries (from FST/FR to biocompatibility). Thanks to advances in material development and printing process control, the technology is now ready for deployment in real-world manufacturing environments.

Whether you are producing small batches, creating a unique variant in low quantities, or need to solve complex geometries that casting cannot handle, silicone 3D printing offers a more agile and cost-effective way to achieve your goal.