3D Systems documents the VisiJet RBK-RWT-L60 Multi-Material Composites configuration as a two-cartridge rigid photopolymer set composed of VisiJet CR-BK and VisiJet CR-WT 200. The RBK-RWT-L60 designation identifies a simultaneous jetting regimen for a rigid black grade and a rigid white grade on the ProJet MJP 5600 MultiJet Printing platform. The printer’s build envelope is 518 × 381 × 300 mm, and the native addressability is 600 × 600 dpi. The MJP 5600 deposits picolitre-scale photopolymer voxels and a sacrificial wax support through piezoelectric printheads. The product is not a single blended resin or an elastomer. Each resin is jetted from a separate material channel and cured in situ, so black and white volumes retain independent rigid photopolymer properties while sharing a common support material. Typical uses include prototype housings, instrument panels, mating fixtures, and parts requiring embedded contrast markings that would otherwise require assembly or secondary coloring.

What distinguishes the RBK-RWT-L60 two-resin set from a single-resin CR-WT 200 build?

A single-resin CR-WT 200 build produces only white rigid volumes and cannot place a rigid black component in the same green part. The RBK-RWT-L60 configuration removes that limitation at the build-preparation level by assigning CR-BK and CR-WT 200 to separate print channels. The two resins are not co-reacted into a new copolymer; they are placed as adjacent or overlapping voxel domains. The distinction from single-material resins such as VisiJet CR-CL 200 and VisiJet CR-WT 200 used alone is therefore primarily geometric and functional rather than a fundamental change in photopolymer chemistry.

In contrast to VisiJet CE-BK, which is an elastomeric black material with elongation values typically above 100%, CR-BK is a rigid black grade with Shore D values in the 80–84 range. Compared with the M2R-BK and M2R-WT materials used on the ProJet MJP 2500 Plus, the RBK-RWT-L60 set is intended for the larger ProJet MJP 5600 build envelope and for dual-material builds with one support system. Published property data for the RBK-RWT-L60 interface itself are limited; therefore, interfacial strength should be validated by the user according to ASTM D638-14 or a component-specific pull test.

Build preparation begins by assigning separate material channels to each resin. The support material, typically VisiJet S500 sacrificial wax, is jetted as an additional component. Because the resins are opaque and highly pigmented, the radiometric response during photopolymerization differs between the black and white grades. Carbon black in CR-BK attenuates the initiating wavelength, while white pigment in CR-WT 200 scatters light and can alter the depth of cure. Print parameter files for the RBK-RWT-L60 set are designed to manage this offset, but build orientation, printhead condition, and UV lamp output remain process variables. On production-scale systems, the first observable defect in a poorly maintained dual-color build is often delamination or surface tack at the black-white boundary rather than bulk part failure.

When the MJP 5600 platform is loaded with CR-BK and CR-WT 200

The MJP 5600’s piezoelectric printheads maintain an elevated jetting temperature to keep the liquid viscosity within the printhead’s operational window. Obsolete, cold, or contaminated cartridges can produce missing-voxel defects that appear as interphase porosity between black and white regions. The green part is removed from the build chamber and heated to remove the support wax. Support removal is conducted below the deflection temperature of the resins to limit creep. Typical wax removal ovens operate in the 50–65 °C range, with dwell times that depend on part mass and trapped volume.

Residual wax film is removed with a compatible wash specified in the manufacturer’s post-processing guide. Because the heat deflection temperature of both resins is near 50 °C, oven setpoints above that value can permit thin white walls to deflect under self-mass. Builds with blind cavities, snap-fit features, or internal channels require staged support removal to prevent wax retention. After cleaning, parts are inspected for boundary-layer continuity between the black and white domains.

At the transition plane, partially overlapping droplets create a mixed-cure region whose width is on the order of one or two voxel diameters. If the blend line is loaded in tension perpendicular to the interface, failure may initiate before the bulk resin values are reached. Published peer-reviewed data on this specific RBK-RWT-L60 interface are limited; conservative design loads should be used until uniaxial tensile bars with a printed interface are tested to ASTM D638-14. Volumetric polymerization shrinkage also contributes to dimensional deviation, and the black and white resins may require separate scaling factors during build preparation.

Mechanical response under tensile, flexural, and thermal loading

The following consolidated typical ranges are based on manufacturer-published data for the individual resins. No blended-mechanical data are published for the RBK-RWT-L60 interface. Lot-to-lot variation, conditioning history, and build orientation can shift results.

Cured parts are rigid and show relatively low elongation with Shore D hardness near 82. The material set is not suitable for elastomeric seals, gaskets, or rubber-like snap features. Continuous service above 45 °C can produce creep because the heat deflection temperature is near 50 °C. Parts should not be exposed to steam, automotive underhood temperatures, or boiling-water immersion unless the component is mechanically supported and tested for creep. The use of the product as a direct substitute for polycarbonate, ABS, or glass-filled nylon should be validated by application-specific testing rather than by datasheet comparison alone.

Raw material is supplied in sealed cartridges and should be stored at 15–30 °C away from direct UV exposure. Open cartridges left in the printer’s material bay must be protected from moisture ingress and recirculated according to the manufacturer’s maintenance schedule. If cartridges are warmed too rapidly, condensation on the cartridge interface can contaminate the feed line. That failure mode requires purging of both material channels and can force a partial build restart. Viscosity mismatch between the two material channels can translate into interfacial width deviation, so the printer’s recirculation loops and temperature control should be fully stabilized before a dual-material job is released.

If post-processing is constrained by blind cavities and thick sections, what operational boundary applies?

Support wax must be completely removed from blind cavities, snap-fit features, and internal channels before dimensional inspection. In thick black sections adjacent to thin white sections, differential heat absorption during support-wax removal can create local temperature offsets. Because the heat deflection temperature of both resins is near 50 °C, oven dwell times should be staged when the part includes trapped volumes or large unsupported overhangs. Finished parts should not be exposed to continuous service above 45 °C unless the component is physically supported and tested for creep. Chlorinated solvents, strong alkaline cleaners, and ketones can attack or craze the cured photopolymer network; cleaning must be limited to the solvent class specified in the manufacturer’s post-processing guide.

For regulatory compliance, the Safety Data Sheet and current EU CLP Regulation (EC No 1272/2008) classification should be checked before use. Any RoHS claim under Directive 2011/65/EU must be verified against the cured-resin test report rather than assumed from the liquid resin SDS. Published application-specific data for this exact RBK-RWT-L60 dual-color configuration are limited; qualification prints with tensile bars and blind-cavity test geometries are therefore required before production quantities are committed. The principal operational distinction from single-material rigid photopolymers remains the two-channel jetting control at the black-white interface, and that interface is the most critical location for both mechanical validation and process control.