3D Systems VisiJet M3 Navy is an opaque navy-blue acrylate photopolymer supplied for MultiJet Printing (MJP) platforms. The material is distributed as a sealed cartridge, jetted through multi-nozzle printheads, and polymerized by integrated UV lamps during layer formation. It is a rigid, high-resolution build material in the VisiJet M3 family and is commonly used for functional housing prototypes, assembly jigs, and presentation models where a dark blue finish is specified. Manufacturer-published data list tensile elongation at 15% under ASTM D638, flexural strength at 45 MPa under ASTM D790, and heat deflection temperature at 60 °C under 0.45 MPa load using ASTM D648. On ProJet MJP 2500/2500 Plus systems, the vendor reports an X-Y resolution of 1200 × 750 dpi and layer thickness options of 16 µm and 32 µm. These values place M3 Navy in the rigid short-chain-acrylate class of MJP materials rather than in elastomeric or sacrificial casting chemistries.

Material Constitution, Print Resolution, and Support-Handling Requirements

M3 Navy is based on a proprietary acrylate formulation; unlike the investment-casting photopolymers in the VisiJet Procast line, it does not contain a wax fraction designed for burn-out. The liquid is not a thermoplastic melt, and the printed network is thermoset after UV polymerization. The standard companion support material is a melt-away wax supplied by the system vendor; support removal is normally carried out in a circulating-air oven at 70 °C. After the wax melts, residual films are displaced in a heated mineral-oil bath at 60 °C to 70 °C. Because the navy pigment creates an opaque dark surface, visual detection of wax residue is better than with translucent MJP materials but less immediate than with pure black under directional inspection. A high-color-temperature inspection source of 4000 K or above is commonly used to distinguish wax films from the blue surface.

The obtainable resolution is determined by printhead nozzle pitch, carriage encoding, and layer thickness rather than by the material alone. On ProJet MJP 2500/2500 Plus platforms, the vendor lists 16 µm and 32 µm vertical layer options. The 16 µm layer mode is specified for fine vertical sidewalls and shallow embossed logos; the 32 µm layer mode reduces build time but produces more visible step lines on gently sloped surfaces. Because the dark blue pigmentation limits light transmission through the part, microchannels and blind cavities with narrow cross-sections require drainage-oriented design and may require support removal aids.

The manufacturer-published typical mechanical properties are reproduced below. These are datasheet values, not batch specifications; lot-specific certificates should be consulted before production commitments.

What Limits the Use of M3 Navy in Snap-Fit and Elastomeric Applications?

The tensile elongation value of 15% under ASTM D638 establishes M3 Navy as a rigid material with limited ductile extension. In cantilever snap-fit geometries, the maximum bending strain should be estimated from beam deflection and cross-section thickness; if the calculated strain approaches the yield region during multiple insertion cycles, surface crazing and brittle fracture occur. The notched Izod impact result of 25 J/m under ASTM D256 is below many unfilled injection-molding ABS grades, so clips with re-entrant corners and sharp notches are vulnerable to impact loading. Published fatigue data for M3 Navy under multi-cycle snap-fit deflection are limited; therefore, designs that require repeated cycling require coupon-level validation under the intended deflection rate. The heat deflection temperature of 60 °C at 0.45 MPa under ASTM D648 indicates that load-bearing service above 50 °C should be derated. The material is not suited for living-hinge geometries or components that must undergo recoverable strain greater than 10%.

Because the polymer is a cross-linked acrylate, exposure to ketone solvents causes swelling and stress cracking. Acetone, methyl ethyl ketone, and aggressive glycol ethers should be excluded from cleaning operations. Isopropanol is acceptable for short-term surface wipe-down, but immersion should be minimized. No food-contact compliance under FDA 21 CFR 177 or European Commission Regulation (EU) No 10/2011 is documented for M3 Navy. The standard product documentation does not list USP Class VI or ISO 10993 biocompatibility statements. These exclusions are operational boundaries rather than post-processing cautions.

After the completed build tray is removed from the MJP system, the parts are transferred in a dense-packed orientation to a circulating-air oven set at 70 °C. The primary process risk is non-uniform temperature rise in thick sections and heavily loaded trays. If the coldest point remains below the support-melting target, residual wax films remain in deep slots and blind holes; these films later contaminate the oil bath and produce a hazy, low-gloss surface after drying. The remedy is not to raise oven temperature above 75 °C, because thin walls below 0.8 mm can distort under their own weight. Instead, the tray load should be reduced and drain channels oriented to gravity. The subsequent mineral-oil bath is typically held at 60 °C to 70 °C with ultrasonic agitation. Ultrasonic transducers operating above 40 kHz may generate cavitation erosion at sharp corners; the user should confirm that the bath is rated for polymer cleaning and that oil temperature does not exceed 70 °C during extended cycles. Residual mineral oil is then removed with a detergent wash or isopropanol wipe. The dark blue surface aids detection of whitish wax residue under 4000 K inspection light.

Dimensional compensation factors for M3 Navy are usually embedded in the printer operating system; manual cube-test scaling is not required. However, when close-fitting assemblies are printed, the user should verify internal and external dimensions after support removal because the wax-melting step changes residual stress distribution. Thin bosses with diameters below 3 mm are prone to wax retention; if the assembly requires untapped screw bosses, a drilling or reaming operation to 3 mm may be necessary. The elongation and hardness values in the table above should not be used as exact finite-element inputs without measured tensile curves, because photopolymer response is strain-rate dependent.

When Dark Blue Pigmentation Compromises Blue-LED Structured-Light Scanning

M3 Navy is selected for dark blue cosmetic prototypes, but the same pigmentation can interfere with dimensional metrology instruments that project blue LED structured light. The navy surface absorbs a significant portion of incident blue light, reducing the contrast of projected fringe patterns. Typical blue LED scanners operate at 450 nm to 470 nm; a dark blue surface in this range may require longer exposure times or the application of a fine anti-reflection scanning spray based on titanium dioxide or calcium carbonate. In comparison, M3 Black attenuates visible light across a broader band, while white or grey MJP materials return stronger signal. For production-scale dimensional verification, the user should therefore certify the metrology routine against a matte standard with the same surface treatment as the printed part. Published data for scanner-specific response on M3 Navy are limited; no universal correction factor should be assumed.

Surface roughness and stair-stepping also influence optical scanning. The 16 µm layer mode reduces vertical stepping but increases build time. M3 Navy may be sanded with 600-grit wet paper to remove peaks and increase contrast uniformity; however, aggressive sanding of thin walls below 1.0 mm may create localized heating and gouging. Process development should use a standardized ball-crater or confocal profilometry method to quantify roughness before scanning. Surface texture parameters under ISO 4287 or ASME B46.1 are recommended because scanner accuracy is affected by both Ra and peak-to-valley height. The use of a titanium dioxide-based developer spray changes the surface signature; therefore, measurements should report whether the surface was sprayed.

Across the M3 Acrylate Family, Navy Diverges from Black and X

VisiJet M3 Navy and VisiJet M3 Black share a rigid M3 acrylate base. Their published tensile and flexural values frequently overlap within datasheet typical variation, and the principal selection factor is colour. M3 Navy provides a less severe spectral absorption band than M3 Black, which can be advantageous when inspection occurs under blue-rich illumination, but it is less neutral for colour-critical mock-ups. In contrast, VisiJet M3-X is formulated for higher impact resistance and greater elongation; it is recommended for snapping features, flexible latches, and parts that require higher ductility than M3 Navy. The substitution of M3 Navy into an M3-X application is not advisable when the feature is a living hinge or flexible latch. VisiJet M3 Procast is a wax-filled build material for investment casting, not a structural acrylate; M3 Navy leaves a cross-linked residue during burn-out and is not suitable for that process. VisiJet M2R-GRY grey material is another rigid MJP option with different pigmentation and may be preferred when blue light absorption creates metrology difficulty. These distinctions are based on material-selection data rather than universal ranking; users should compare the complete property table for each candidate.

Because M3 Navy and M3 Black are visually close in low-light environments, a production documentation control should record the part number and the cartridge lot. Colour-batching between jobs is controlled by the vendor’s manufacturing process, but surface finish and post-processing can shift apparent colour. Under a standard D65 illuminant, visual comparison should be made against an approved master plaque. The dark blue surface also requires higher illumination than white or grey materials when checking for surface defects such as cracking, pitting, or wax bloom.

For inventory control, sealed cartridges are stored between 15 °C and 30 °C and protected from direct sunlight. The material is UV-sensitive in its uncured state; therefore, open handling should occur away from stray UV sources. Standard MJP cartridges should be warmed to the printer bay temperature before installation, and condensation on the cartridge exterior should be avoided. Published data on long-term UV stability of printed M3 Navy parts under outdoor weathering are limited; parts intended for continuous outdoor exposure should be protected with a UV-stable topcoat and tested according to ASTM D4329 or ASTM G154 if service life claims are required. The material is not documented as flame-retardant; applications requiring a UL 94 V-0 rating should not assume compliance. Any mechanical property value used for tolerance stack-up should be re-verified on printed test coupons from the same machine, layer thickness, and post-processing route.

M3 Navy is supplied ready to jet, and no external mixing or vacuum degassing is performed before cartridge installation. The use of non-vendor cleaning solvents is restricted to those identified in the printer material handling guide. The combination of M3 Navy with amine-based epoxy adhesives should be tested for cure inhibition and surface attack; some amine hardeners can affect acrylate surfaces. Mechanical fastening with threaded inserts should be preceded by a pilot-hole test because the thermoset network may crack at hole edges if the insert is driven without a chamfer or the hole diameter is below manufacturer recommendation.