3D Systems VisiJet M2R-TN is a tan-pigmented, UV-curable photopolymer build material qualified for the ProJet MJP 2500 and ProJet MJP 2500 Plus MultiJet Printing systems. The material is supplied in sealed, light-locked cartridges that load directly into the printer material bay. During the build, resin is jetted through piezoelectric printheads and cured by the integrated UV source; the sacrificial support is VisiJet M2 SUP wax, which is removed after printing by thermal melt-out and solvent-assisted cleaning. System-level build parameters include a layer thickness of 32 µm, an X/Y resolution of 1200 x 1200 dpi, and a maximum build volume of 294 x 211 x 142 mm. These values describe the printing system, not final part tolerance. Shrinkage, support removal, and orientation produce dimensional deviation; datum-to-datum accuracy must be established on the target build orientation.

Full monomer composition remains proprietary. The cured material is a glassy, rigid acrylic network, not a rubber-toughened or elastomeric photopolymer. It should not be specified as a direct replacement for impact-modified ABS or polypropylene. Long-term creep and fatigue datasets for the TN variant are limited; load-bearing parts must be validated by specimen-level testing on the target orientation. Uncured resin contains UV-curable acrylate constituents and requires handling according to the current safety data sheet. Cartridge loading and support removal should be conducted with dermal protection because uncured residues remain on green parts. The cured polymer is not certified for food-contact or medical-service use without application-specific assessment.

What are the mechanical test requirements and orientation-dependent limitations for M2R-TN?

Mechanical characterisation begins with conditioning according to ASTM D618. Tensile properties are determined with ASTM D638-14 using Type IV specimens. Flexural properties are measured with ASTM D790-17 Method I. Heat deflection temperature is reported with ASTM D648-18 at stress levels of 0.455 MPa and 1.82 MPa. Notched Izod impact is tested with ASTM D256-10 Method A. Shore D hardness is obtained with ASTM D2240-15. Moisture uptake is evaluated with ASTM D570-98(2018) following 24 h immersion.

Reported values are orientation-dependent. MultiJet Printing produces layer-to-layer boundaries that are mechanically weaker than the XY plane; tensile specimens built in the ZX orientation typically show lower strength and elongation than XY specimens. Current published 3D Systems datasheets for M2R-TN provide limited Z-direction data, so users should generate their own orientation-specific values. The tan pigment affects UV absorption relative to clear M2R-CL, which can change cure depth, edge acuity, and positive-feature sharpness. Dimensional compensation offsets developed for M2R-WT should not be transferred without a pilot run on the actual geometry.

Process conflict occurs when print speed is increased to improve throughput: higher jetting frequency can reduce per-drop UV dose, leaving under-cured interlayers that weaken Z-axis tensile strength. On production MJP cells, this is managed by maintaining manufacturer default lamp irradiance and cleaning the UV window. Degraded UV lamps or clouded quartz windows shift the cure state and change part colour. Irradiance should be checked with a calibrated radiometer at the build plane at intervals specified in the printer maintenance schedule. If lamp output falls below the OEM threshold, the batch should be rejected or revalidated because mechanical data from conditioned specimens no longer apply.

Solvent contact, moisture uptake, and sub-60 °C creep boundaries

Cured M2R-TN is stable in dry indoor environments but can absorb moisture from humid air. Conditioning at 23 ± 2 °C and 50 ± 5 % RH per ASTM D618 is required before comparative mechanical testing. Immersion in water or exposure to condensation plasticizes the acrylic network and reduces modulus; reversible moisture uptake should be measured with ASTM D570-98(2018). The material is not recommended for continuous immersion in aggressive aqueous chemistries, ketones, chlorinated solvents, or strong bases. Any contact with process fluids should be screened with ASTM D543-21 using visual, mass, and Shore D change after the specified exposure interval. Published chemical compatibility data for M2R-TN specifically are limited; solvent resistance of pigmented MJP acrylics is generally inferior to engineering thermoplastics such as polypropylene or polyamide.

Thermal service is constrained by the glass transition and heat deflection behaviour of the cured network. For this class of rigid acrylic photopolymers, HDT is below 60 °C; the exact value is batch- and colour-dependent. Sustained load at temperatures approaching the HDT produces creep. Parts should not be used in hot-end or under-hood tooling unless the expected service temperature is validated with a creep test under the actual load case. Elevated temperature exposure above 70 °C, even during short support-removal dwells, may induce distortion if parts are unsupported. Warpage in thin-wall sections is aggravated by asymmetric support placement because the support wax has lower thermal conductivity than the metal build tray. Large flat plates should be oriented off-axis or supported with a lattice to reduce oil-canning; published numerical correction factors for this configuration are limited.

On production lines, support removal for M2R-TN is carried out in a forced-convection oven at 70 ± 5 °C to melt the VisiJet M2 SUP wax. The residual wax is then removed in an ultrasonic bath charged with 3D Systems EZ Rinse C at 35–45 °C, followed by a warm water/detergent rinse and compressed-air drying. Oven residence should be kept at the minimum required for support melt-out because prolonged exposure above the resin glass transition temperature creates slack, warpage, and surface marking. Wax loading in the cleaning bath must be controlled; an exhausted bath leaves a wax film on downward-facing surfaces and interferes with subsequent painting, solvent bonding, or adhesive joining. Batch-to-batch variation in tan pigment dispersion has been observed as minor shifts in colour saturation and surface gloss; vision-system inspection thresholds may need adjustment when cartridge lots change. Cartridge identification and material bay settings reject incompatible feedstocks, so M2R-TN should not be used in systems designed for VisiJet M3 or M2 CAST materials.

When M2R-TN replaces M2R-WT or M2R-CL in an existing fixture build, what adjustments are required?

M2R-TN is not a drop-in colour substitute without validation. The tan pigment package changes UV absorbance relative to clear M2R-CL and may require adjustment of local cure exposure or printhead drive parameters. Existing build parameters for M2R-WT are closer, but dimensional scale factors should be re-established because pigment-dependent shrinkage anisotropy can shift small-hole diameters, snap-fit clearances, and mating surfaces. The material is an opaque, non-decorative tan that reduces visible layer lines in some appearances; it is used for functional prototypes, assembly aids, and covers where post-print painting is not required. It is not intended for investment-casting patterns; VisiJet M2 CAST should be specified for burnout because M2R-TN may leave residues. Compared with laser-sintered polyamide 12 parts, M2R-TN should be expected to have lower impact resistance and lower thermal deflection, but smoother sidewalls and finer negative features on the MJP platform. Published numeric comparison data for M2R-TN versus polyamide 12 or M2R-CL is limited; a side-by-side functional test on the target fixture is required before substitution.

Adhesion and finishing operations on M2R-TN require scuff sanding and primers compatible with UV-cured acrylics. Coating adhesion should be assessed with ASTM D3359-17 cross-cut tape testing after the specified conditioning. Unpainted parts exposed to direct sunlight may undergo colour shift or surface embrittlement; accelerated weathering data for M2R-TN are not provided in standard literature, so outdoor service should be screened with ASTM G154-23 QUV exposure before implementation. When bonding M2R-TN to metal or other plastics, lap-shear specimens prepared with the intended adhesive and tested per ASTM D1002-10 or ASTM D3163-01 provide an objective basis for joint design.