3D Systems VisiJet EBK-ENT-R64 is a two-cartridge material package containing VisiJet CE-BK (black) and VisiJet CE-NT (natural) for MultiJet Printing platforms configured to run paired CE-series resins. The kit designation EBK-ENT-R64 identifies the cartridge format and color pairing; it is not a single resin part number. The alphanumeric suffix R64 is a packaging and cartridge identifier, not a material grade symbol. Both materials are rigid CE-series materials with a common base polymer and different pigmentation. The phrase “multi-material composites” in the product designation refers to the paired material set and to the generation of multi-resin regions within one build; it should not be interpreted as a statement of fiber reinforcement or particulate filler unless the current technical datasheet explicitly lists filler content. The kit is intended for systems that accept EBK-ENT cartridges and that are licensed by the manufacturer to assign material channels to CE-BK and CE-NT. Using the cartridges in an unlicensed single-material profile may produce incorrect cure energy, poor jetting stability, or unsupported material-channel assignments.

Jetting behavior is controlled by the printer’s material profile. The cartridge bay heats the resin to a controlled viscosity, the printhead firmware assigns droplet waveform and voltage to each material channel, and the support wax is deposited as a separate phase. The planarizer or roller levels the layer after deposition, and an in-line UV source solidifies the material. Because CE-BK and CE-NT share a base polymer, their solidification rates are close, but the black pigment alters thermal absorption in the melt path and UV absorbance in the cure step. In large black regions adjacent to thin natural features, the black zone may absorb more radiation and reach full cure earlier; the printer’s closed-loop UV power control normally compensates, but process engineers should verify edge flatness with side-by-side test tiles. Published rheological curves for this specific configuration are limited; the current manufacturer datasheet and printer material profile revision are the authoritative reference. On compatible MJP platforms, the nominal layer thickness is 0.032 mm, with build resolution defined by the printhead matrix and material-specific print mode. Non-default layer settings should not be used without a validated profile, because edge-definition variation in fine text and thin color boundaries is a known process issue.

What Distinguishes the CE-BK/CE-NT Pair from Single-Color MJP Resins?

Single-color systems such as VisiJet M2R-TN and VisiJet M2R-BK require an operator to switch cartridges or to apply a post-print coating to achieve black and natural regions. The EBK-ENT-R64 pair instead assigns two material channels in one build file, so black and natural zones can be jetted in the same layer sequence. The black and natural designations refer to visual contrast, not to separate mechanical property classes unless the current datasheet shows different tensile, flexural, or impact values. Compared with VisiJet M2G-DUR, which is specified for polypropylene-like toughness, the CE-series pair is a rigid multi-material system; elongation at break and notched Izod impact should not be assumed to match durable resin grades. Compared with VisiJet M2S-HT90, the CE-series kit does not automatically confer high-heat performance. Heat deflection temperature must be read from the current CE-BK and CE-NT datasheets under ISO 75-1:2020 or ASTM D648-18. The multi-material designation also does not imply a chemical bond superior to overmolding; the interface is formed by jetted droplets and carries its own finite strength.

Mechanical test data for the CE series are reported under standard methods. Tensile strength and elongation at break are typically obtained under ISO 527-1:2019 and ISO 527-2:2012 or ASTM D638-14. Flexural strength and modulus are obtained under ISO 178:2019 or ASTM D790-17. Notched Izod impact is reported under ASTM D256-10(2018); the specimen geometry and notching method must be stated. Heat deflection temperature is reported under ISO 75-1:2020 / ISO 75-2:2013 Method A or ASTM D648-18, with the applied stress level stated in the report. Shore hardness is reported under ASTM D2240-15. Density is reported under ISO 1183-1:2019 or ASTM D792-20. Comparisons across materials require identical build orientation, layer thickness, post-processing, and conditioning at 23 ± 2 °C and 50 ± 5 % RH. Values produced under different thermal history, cleaning agents, or storage conditions are not interchangeable.

Published data for this specific configuration is limited to the manufacturer’s current technical data sheet and the platform material profile release notes. No derived value from this table should be used for load-bearing design without a documented test report from the production lot. If a certification body requires traceable mechanical data, the test coupons should be built on the same machine, with the same cartridge lot, and under the same support removal protocol as the production parts.

When High-Contrast Multi-Material Builds Must Survive Support Removal and Air-Drying

Support removal uses the MJP wax-melting and cleaning sequence specified for the platform. The black and natural regions can absorb heat and cleaning solvent at different rates; a black/natural interface may therefore develop a slight step, gloss change, or bond-line variation if the cleaning bath temperature is above the recommended set point or if dwell time is extended. Process validation should include a representative interface coupon with the same wall thickness, orientation, and color boundary geometry as the production part. Unlisted cleaning solvents must be screened under ASTM D543-21 for mass and dimension change before use. Drying must remain below the heat deflection temperature stated in the CE-series datasheet; forced-air oven settings above the datasheet limit are a known failure mode for thin multi-material walls. Operators should inspect the black/natural interface after drying for delamination or localized distortion before dimensional inspection. The use of ultrasonic cleaning may produce different results on pigmented and unpigmented regions; if ultrasonic energy is allowed, its power density and cycle time should be fixed in the work instruction.

Build orientation changes the distribution of black and natural voxels at the interface. When the interface is parallel to the jetting path, the boundary may be smoother than when the interface crosses multiple layers, because layer-wise mixing and UV cure produce different edge conditions. A design with a black/natural boundary at a shallow angle to the z-axis should be tested with orientation iterations before production. Shrinkage compensation is applied by the build processor per material region. If the two factors differ by more than the tolerance stack, the interface may show a step. The manufacturer’s build parameter set includes separate scale factors for CE-BK and CE-NT; changing one without the other is a known process error.

Typical use cases include color-coded jigs, fixtures, teaching models, fluid-path demonstration parts, and functional prototypes that require visual separation of black and natural regions. If a part is to be used in a medical device or food-contact application, the current material certification must explicitly state compliance under FDA 21 CFR 177 or ISO 10993-1:2018; the kit designation alone is not a biocompatibility claim. No safety-critical load-bearing release should proceed without destructive testing of the black/natural interface, because interface strength can be lower than the bulk CE-series material. Dimensional accuracy of multi-material parts should be verified on the black/natural interface using contact or non-contact measurement; datum features should be located away from the interface where possible. Surface roughness in the z-axis is influenced by the 0.032 mm layer thickness and by the material profile; if a roughness value is required, measurement should follow ISO 21920-2:2021 and be reported with the cutoff length. Adhesives, coatings, and inks should be screened on both CE-BK and CE-NT coupons under the manufacturer’s compatibility guide; solvent-based systems may swell the pigmented region differently.

Color contrast should be specified by a measurement method if it is critical. Spectrophotometric readings under ISO 11664-4:2008 using a defined illuminant and observer can track ΔE between CE-BK and CE-NT regions. Visual comparison alone is not repeatable. The contrast may shift after cleaning, drying, or prolonged UV exposure; acceptance measurements should therefore be taken on finished parts.

Safety data sheets for VisiJet CE-BK, VisiJet CE-NT, and the support wax are the controlling documents for handling and disposal. The CE-series resins are industrial photopolymers; uncured or partially cured material should not be discharged to drains or disposed of as office waste. Operators should use impermeable gloves and eye protection during cartridge changes and support removal. Cured parts are generally handled as plastic articles, but parts removed from the cleaning bath before full drying may retain cleaning solution. Ventilation should be sufficient to control solvent vapor below occupational exposure limits. Waste cartridges and contaminated cleaning agents are managed under the applicable local hazardous waste rules. No claim of food-contact or medical suitability is made by the EBK-ENT-R64 package unless the manufacturer’s current compliance certificate explicitly lists the material set.

Unopened cartridges should be stored according to the cartridge label and SDS. The black cartridge may show longer thermal equilibration after cold storage than the natural cartridge because of higher radiant absorption; production lines should allow the cartridge bay to reach steady-state temperature before starting a build. Batch-to-batch variation in pigmented resin can alter edge definition in small features, so a first-article check is recommended after cartridge lot changes. The printer’s material profile records cartridge identification and usage; this log should be retained for traceability when CE-series parts are produced under a quality system. Published quantified batch-to-batch rheology shift for EBK-ENT-R64 is limited. If a job requires statistical process control, the manufacturer’s cartridge lot history should be compared against dimensional data from a standard test specimen built at the beginning of each shift.

Operational boundaries include the need to use only approved support wax, to maintain cartridge bay and printhead cleanliness, and to avoid mixing CE-series resins with single-color M2R or M2G resins in the same material channel unless the platform explicitly permits directed multi-material assignments. Solvent exposure, prolonged UV radiation, and temperatures above the stated heat deflection limit can alter dimensions and visual contrast. Any deviation from the manufacturer’s build parameter set should be managed as a process change, with documented first-article inspection and retention samples. If the application requires flame rating, electrical conductivity, or outgassing certification, the relevant UL 94, ASTM D257-14, or ASTM E595-15 report must be obtained separately; these properties are not implied by the EBK-ENT-R64 designation. The use of the EBK-ENT-R64 kit should be discontinued if a cartridge is punctured, expired, or contaminated, and the printer’s material profile should be audited after any major maintenance operation.