When a product development program reaches the stage of functional testing, endurance validation, or regulatory submission, the parts need to behave exactly like production parts. Same material. Same wall thickness. Same mechanical response.

3D printing and vacuum casting serve earlier stages well — geometry review, fitment checks, CMF evaluation. But neither delivers parts in actual engineering plastics. When the test requires the real material, soft tooling and injection moulding is the right process for any functional prototype that must perform under real-world conditions.

Soft tooling refers to injection moulds machined from aluminium or unhardened steel — EN31 or P20 — rather than the hardened steel used in production tooling. The mould produces parts through standard injection moulding, in the same engineering plastic grades used in final production.

The trade-off is tool life. A soft tool supports the quantities needed for testing, validation, and pre-series builds — far fewer than the hundreds of thousands of shots a hardened production tool is designed for. The lower tooling cost and shorter lead time make it the most practical option at that stage of development.

For any functional prototype requiring genuine material properties, soft tooling delivers where additive manufacturing cannot.

Parts in Actual Engineering Plastics – Including ABS Materials and Nylon Materials

This is the core reason. Soft tooling delivers injection-moulded parts in the exact material grade the final product will use. Unlike 3D printing, which uses SLA materials that are photopolymer approximations, soft tooling gives you true thermoplastics.

Common engineering plastics for functional prototype parts:

No polyurethane approximations. No resin equivalents. The functional prototype that goes into your test rig, endurance chamber, or regulatory submission is made from the same ABS materials or nylon materials as the production part.

Lead Time of 2-6 Weeks

Soft tools are ready in 2-6 weeks from design freeze — significantly faster than hardened production tooling. For programs under timeline pressure, this means functional parts in hand while the program is still in active development, not after it has moved on.

50% Lower Investment Than Production Tooling

Soft tooling reduces tooling investment and lead time by 50% compared to production tools. For programs that need real material parts but are not yet ready to commit to production tooling — because the design is still being refined or volumes are not yet confirmed — this is the most cost-effective path to functional prototype validation.

DFM and Moldflow Built In

Every soft tool at Marcopolo goes through DFM review and Moldflow analysis using Moldex3D, with tool design managed in VISI, Creo, and Siemens NX before machining begins. Manufacturability issues are identified and resolved before the tool is cut — not discovered during trials.

Texturing and Finish as Required

Soft tools can be post-processed for the required surface finish and texture as per 2D specifications — the same as production tools. Parts coming off a soft tool can match the intended final aesthetic, not just the functional requirement.

In-House ECN Management

Design changes happen during development. Marcopolo’s in-house team manages tool updates and engineering changes with tool update tracking, keeping the tool aligned with the latest design revision throughout your functional prototype program.

Understanding material differences is critical when selecting the right process. This is especially important when deciding between a functional prototype made via soft tooling versus a visual model from additive manufacturing.

Understanding material differences is critical when choosing the right process for your functional prototype.

Key takeaway: SLA resins are well-suited for visual and form-fit models. ABS-grade materials and nylon-based resins from soft tooling are appropriate for actual load-bearing and environmental testing. For any parts for functional validation, soft tooling is the right choice.

Automotive

Pre-series and homologation builds, endurance testing of interior and exterior components, proto-vehicle supply when production tooling is delayed. Soft tooling serves validation and pre-series stages — not mass production supply.

Common ABS materials used: ABS, PC-ABS for interior trim
Common nylon materials used: PA6 GF30 for structural brackets

Medical Devices

Regulatory submission samples in biocompatible grades including PC, PSU, and PEEK. Low-volume production of device housings and enclosures.

Industrial Electronics

Smart meter and IoT enclosures, switchgear housings, and telecom equipment covers in FR-rated and ESD-safe grades at low MOQ.

Robotics and Industrial Equipment

Structural housings and covers in high-performance engineering plastics for functional testing before committing to production volumes.

When you need a functional prototype that behaves exactly like a production part, soft tooling bridges the gap between visual models and mass production.

Our team will review your design, run DFM and Moldflow analysis, and recommend the right tooling approach for your program. Whether you need ABS materials for interior components or nylon materials for structural parts, we deliver.

With 25+ years of tooling and moulding experience and 1,400+ tools developed, Marcopolo manages the full process in-house — from DFM and Moldflow through soft tooling, injection moulding, and transition to production tooling. One partner, one continuous program, no handoffs.

Our Complete Service Offering for Functional Prototype Parts:

•  25+ years of tooling and moulding experience

•  1,400+ tools developed across automotive, medical, electronics, and industrial sectors

•  In-house DFM and Moldflow – no external handoffs

•  True engineering plastics – not approximations

•  Single partner from prototype to production

Get a Quotation – Ready to move beyond resin approximations? Let’s talk about soft tooling for your next validation program. Whether you need ABS materials, nylon materials, or any engineering thermoplastic, we deliver functional prototypes you can test with confidence.