3D Systems VisiJet RCL-ENT-A40 Multi-Material Composites is a two-phase photopolymer set identified by the combination of VisiJet CR-CL 200** and VisiJet CE-NT. Unlike single-cartridge photopolymer resins that produce monolithic parts, the RCL-ENT-A40 set is configured for material jetting platforms capable of dispensing two distinct photopolymers into one build sequence. The A40 designation in the manufacturer nomenclature indicates a nominal durometer target of 40 Shore A for the CE-NT phase when evaluated according to ASTM D2240-15e1. The CR-CL 200** phase is specified as a clear rigid photopolymer, while the CE-NT phase provides elastomeric behavior for sealing, gripping, and strain-absorbing features. Published data for this specific configuration is limited; mechanical property statements should therefore be obtained from lot-specific certificates of analysis and not from generic acrylate photopolymer documents. The primary usage is in multi-material prototypes and short-run production parts where a rigid clear region must be integrated with a flexible region without adhesive bonding or mechanical assembly. Representative application areas include fluidic devices with transparent inspection windows, medical device housings with soft-touch overmolds, and consumer electronics enclosures that require localized elastomer seals. Each application requires validation of the finished part under the relevant end-use standards, because the phase boundary rather than either bulk material may dominate long-term performance.

What Material Pairing Defines the RCL-ENT-A40 Build Set?

The set contains two distinct jettable photopolymer phases. VisiJet CR-CL 200** functions as the rigid structural phase. Its clarity supports optical path requirements, and its higher crosslink density contributes to dimensional stability in load-bearing features. VisiJet CE-NT functions as the elastomeric phase. The A40 suffix is associated with a nominal hardness of 40 Shore A, placing it in the soft-flexible range rather than the semi-rigid range. Compared with VisiJet M2R-CL, a single clear rigid material, the RCL-ENT-A40 set introduces a controlled material discontinuity that can reduce assembly part count but requires explicit interfacial qualification. Compared with VisiJet M2G-DUR, which is a single durable rigid material, the two-phase set offers spatial modulation of stiffness rather than a homogeneous toughness improvement. When the two phases are jetted in alternating or graded patterns, the mechanical response depends on the printed phase volume fraction, feature size, and transition topology. The material set does not behave as a miscible blend; it forms a bonded composite with a finite interphase zone. The thickness of that interphase zone is influenced by jetted layer thickness, UV dose, and the surface conversion state of the previously jetted layer. Because the exact interphase thickness is not published for all build modes, it should be measured on cross-sectioned coupons using optical or scanning electron microscopy.

In production-scale material jetting equipment, the RCL-ENT-A40 cartridges are maintained in temperature-controlled bays with recirculation loops. Piezoelectric printheads jet the two phases according to layer-wise bitmaps generated from the CAD model. Build layer thickness is equipment-specific and must be selected from the validated process set; published data for this specific configuration is limited for unsupported layer heights. The rigid phase and elastomeric phase must be matched for jetted drop volume, UV penetration, and substrate wetting. If the CE-NT phase is jetted onto a partially cured CR-CL 200** surface, residual reactive species at the interface can promote covalent bonding. Conversely, overexposure of the clear rigid phase can reduce residual acrylate groups and shift failure toward adhesive delamination. Batch-to-batch viscosity drift in the CE-NT phase alters drop velocity and may create interface misregistration. Inline filtration at 1–5 µm is commonly used to prevent nozzle clogging, but the filtration efficiency must be confirmed for the elastomeric phase because high-viscosity materials can exhibit shear-induced filtration effects. Jetting instability in production lines is most often observed as missing jets, satellite droplets, or periodic interface voids. These defects are not reliably detected by visual inspection alone; automated vision systems or mass-based density checks are required for critical parts.

Interfacial Cure Gradients in the Rigid–Elastomer Transition Zone

The mechanical continuity of RCL-ENT-A40 parts depends on the cure gradient across the transition zone. UV irradiance attenuates through the transparent rigid phase and is scattered by the elastomeric phase; the result is a non-uniform conversion of acrylate double bonds. Interface strength is evaluated by destructive testing on representative coupons. Peel resistance may be measured according to ASTM D6862-11, while lap shear specimens can follow ASTM D3163-01(2023). These standards provide comparative data when specimen geometry and conditioning are kept constant; they do not remove the need for lot-specific validation. The difference between the rigid phase’s high crosslink density and the elastomeric phase’s lower crosslink density creates a modulus divergence that concentrates stress near the jetted interface. Parts with abrupt transitions are therefore more likely to delaminate under flexural fatigue than parts with graded transition regions. Production-scale lines have exhibited edge delamination when the elastomeric phase is jetted at lower temperatures, because viscosity increases reduce wetting and diffusion into the rigid phase surface. Use of heated build chambers can reduce this risk, but the chamber temperature must remain below the CE-NT phase thermal deflection limit. For fluid-exposed parts, the elastomeric phase may swell more than the rigid clear phase. Swelling mismatch creates shear stress along the interface and can reduce tensile strength. Qualification for fluid handling applications should include immersion testing per ISO 62:2008 followed by tensile testing to ASTM D638-14, with mass change and dimensional change recorded at 24 h and 168 h. Without this data, the assumption that the rigid phase dominates solvent resistance is not supported. The interface should also be inspected after thermal cycling because differential expansion between the phases can generate microcracks. A thermal cycle from −20 °C to 60 °C is a useful screening profile for general-purpose prototypes, but the final profile must match the intended use environment.

When Cartridge Temperature Deviates From the Jetting Window

Cartridge temperature stability defines the lower and upper processing boundaries for the CE-NT phase. If the resin temperature falls below the manufacturer-specified jetting window, dynamic viscosity rises and the piezoelectric printhead may produce satellite droplets or missing nozzles. On a production line, this condition appears as periodic interface voids and a loss of Shore A repeatability within a batch. If the temperature exceeds the upper boundary, the CE-NT phase may begin thermal-oxidative degradation, shifting its durometer upward and reducing elongation at break. Operators should monitor the recirculation system’s temperature sensors and heater output against the material-specific setpoint. Thermal deviation alarms should trigger a jetting pause and a test coupon print. The coupon set is typically evaluated by ASTM D2240-15e1 for hardness, ASTM D638-14 for tensile properties, and cross-sectional microscopy for void density. If the void count exceeds the internal acceptance limit, the batch should be purged and the printhead cleaned. Because published data for this specific configuration is limited, the acceptable temperature range must be taken from the current VisiJet RCL-ENT-A40 handling documentation and not from generic UV resin guidance. In addition, the temperature of the build platform should be controlled independently, because thermal gradients across thick multi-material sections can produce warpage at the phase boundary. When thick rigid sections are adjacent to elastomeric regions, a slower cool-down after build completion reduces residual stress. The cool-down protocol should be documented as part of the process recipe. Any change in cartridge lot should be accompanied by a small batch build that includes a standardized interface test coupon and a Shore A hardness coupon. The acceptance limits for these coupons should be derived from baseline data collected on the same machine, not from values transferred from a different material jetting system.

After the build cycle, support removal for VisiJet RCL-ENT-A40 parts typically requires controlled heating of the wax support phase. The upper temperature of the support removal oven must remain below the CE-NT phase thermal oxidative threshold. If the temperature is set too high, the elastomeric phase can show a permanent hardness increase that is detectable by ASTM D2240-15e1 and a corresponding loss in elongation at break. The rigid CR-CL 200** phase is less sensitive to short thermal excursions, but long exposure can accelerate yellowing and reduce transmission clarity. For clear regions that require optical performance, transmission haze should be checked according to ISO 13468-1:2019 or an equivalent spectrophotometric method. Residual wax left in internal channels is a common failure source in fluidic prototypes; automated melting with controlled airflow reduces this risk, but blind channels require validated drainage. After support removal, the parts may require a UV post-cure. The post-cure dose should be delivered uniformly to all surfaces; shadowed regions near the interface may cure to a lower conversion and exhibit lower mechanical strength. Parts with large flat rigid sections and thin elastomer features should be supported to prevent distortion during the thermal steps. Dimensional tolerance should be verified by structured-light scanning or CMM, with particular attention to step height at the material boundary. A practical tolerance band for the interface location should be determined on a per-machine basis. Published data for this specific configuration is limited; therefore, generic post-cure recipes from single-phase materials should not be transferred without validation.

Compared with single-material photopolymers and thermoplastic elastomer molding, the RCL-ENT-A40 set differs in that both phases are jetted in the same build and are cured as a thermoset network. The cured composite cannot be remelted or mechanically recycled in the same manner as injection molding regrind. This thermoset nature limits repair by solvent welding, although localized surface bonding may be possible with compatible adhesives after abrasion and cleaning. The material set may be subject to REACH registration and RoHS 2011/65/EU obligations; finished-device manufacturers should verify the latest SDS and compliance statement. For medical or skin-contact applications, cytotoxicity testing per ISO 10993-5:2009 is not automatically satisfied by the resin classification and must be performed on the finished part after support removal and any post-cure. The use of ISO 527-2:2012 tensile testing for the rigid phase and ASTM D2240-15e1 durometer testing for the elastomeric phase provides a minimum comparative framework, but it does not replace application-specific durability testing under load, temperature, and chemical exposure. Because the phase interface is the least predictable element, inspection plans should include cross-sectional microscopy at a defined magnification and frequency. Lot acceptance should be based on the complete process chain from cartridge conditioning through post-cure, not on a single material property.