Eastman Amphora™ AM3300 3D polymer is an unfilled amorphous copolyester pellet feed intended for conversion into monofilament and subsequent material extrusion additive manufacturing. The product is supplied as a resin rather than as a ready-to-print spooled feedstock; filament converters process the material into nominal 1.75 mm or 2.85 mm filament with a typical diameter tolerance of ±0.05 mm. The polymer is differentiated from styrenic filament feedstocks by its styrene-free formulation, which reduces volatile organic compound release during extrusion and printing. Representative thermal data place the glass transition temperature near 80 °C by differential scanning calorimetry at a heating rate of 10 °C/min, and the heat deflection temperature under a 0.455 MPa load is reported near 94 °C per ASTM D648-18. The resin has a specific gravity of approximately 1.18 g/cm³ per ASTM D792-20 and is described by the manufacturer as a low-odor, styrene-free copolyester for fused filament fabrication and other extrusion-based additive manufacturing processes.

Storage conditions for AM3300 require ambient relative humidity below 60% when possible. If pellet inventories have been exposed to relative humidity above 60%, drying at 70 °C for 4 h to 6 h in a desiccant dryer with a dew point of −40 °C or lower is advised before filament extrusion. Residual moisture above 0.03% by weight, measured by Karl Fischer titration, has been associated with hydrolytic molecular weight reduction, melt viscosity drift, and increased filament surface roughness. Converters should request lot-specific melt flow data before setting barrel profiles because published data for batch-to-batch melt flow variation in this specific resin configuration is limited. Melt flow rate is commonly characterized at 260 °C under a 2.16 kg load per ISO 1133-1:2022, with typical values reported between 6 g/10 min and 8 g/10 min.

How does AM3300 perform during filament extrusion and fused filament fabrication?

Extrusion of AM3300 is conducted on single-screw extruders with 24:1 L/D and a general-purpose screw having a compression ratio of 2.5:1 to 3.0:1. A breaker plate with an 80/120/60 mesh screen pack is used to generate head pressure. Barrel temperatures are profiled from 240 °C near the feed throat to 260 °C to 270 °C at the die. Melt temperature measured by an immersion probe should not exceed 280 °C. Residence time above 15 min at melt temperatures above 270 °C can induce thermo-oxidative yellowing and reduce impact strength. Die pressure between 3.5 MPa and 7.0 MPa is typical for 2.5 mm rod die openings, although published data for specific production line configurations is limited. Water bath temperature for filament cooling is maintained at 50 °C to 60 °C to reduce residual stress. Chilled water below 20 °C has been associated with filament ovality greater than ±0.05 mm because of non-uniform quenching. Closed-loop tension control at 0.2 N to 0.5 N is used during winding to maintain diameter consistency.

During fused filament fabrication, a nozzle temperature of 250 °C to 270 °C, a bed temperature of 90 °C to 110 °C, and an enclosure temperature of 45 °C to 60 °C are commonly used with a 0.4 mm nozzle. Print speed is maintained between 40 mm/s and 60 mm/s. Interlayer adhesion is sensitive to chamber temperature; at enclosure temperatures below 40 °C, tensile strength perpendicular to the layer plane may fall below 60% of the in-plane value. The use of a heated chamber above 60 °C is not required for dimensional stability but can improve sidewall fusion in sections thicker than 6 mm. Unlike many high-temperature amorphous thermoplastics, AM3300 does not require a high-temperature nozzle alloy, though hardened steel or coated nozzles are recommended for extended throughput because of abrasive additive packages in some compounded filaments.

Representative mechanical, thermal, and physical properties after conditioning at 23 °C and 50 % relative humidity

The following representative values are drawn from public technical data and are not to be construed as specification limits. Conditioning prior to testing follows the procedures indicated in the cited standards.

The combination of heat deflection temperature near 94 °C under 0.455 MPa and notched Izod impact above 70 J/m separates AM3300 from unfilled poly(lactic acid), which typically exhibits a heat deflection temperature under 0.455 MPa below 55 °C and notched Izod impact values below 30 J/m. The flexural modulus near 1800 MPa is lower than that of carbon-fiber-filled nylons and lower than that of many unfilled polycarbonates, which places AM3300 in a stiffness range suitable for fixtures and housings that require moderate load-bearing performance without brittle failure.

Regulatory assessment for AM3300 printed parts should be aligned with the intended application. The polymer is a copolyester with low residual monomer content, but processors requiring food-contact compliance should verify current regulatory status with the supplier because published data for this specific configuration is limited. Under REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU as amended, unfilled copolyester resins of this class are not expected to contain restricted substances above threshold limits; lot-specific compliance documentation must nevertheless be obtained. The product is not intended for medical implant applications. No claims regarding USP Class VI or ISO 10993 are made without supporting test documentation. Chemical exposure limits should be established for each application; prolonged contact with chlorinated solvents, ketones, esters, and strong alkaline solutions at elevated temperature should be avoided because of stress cracking risk in copolyester parts. Isopropyl alcohol wipe-downs of limited duration are generally tolerated at ambient temperature.

When AM3300 replaces ABS or polycarbonate in jigs, fixtures, and functional prototypes

In comparative trials on open-architecture fused filament fabrication machines with 0.4 mm brass nozzles, AM3300 printed at 255 °C produces lower odor than ABS printed at 245 °C; published data for quantitative VOC emission rates for this specific formulation is limited. The absence of styrene in the polymer backbone reduces the need for high-capacity extraction ventilation, though local exhaust at the extrusion end remains standard industrial practice. Warpage of AM3300 is lower than that of unfilled ABS. Linear mold shrinkage for injection-molded specimens is reported near 0.004 cm/cm per ASTM D955-08, and printed parts show less than 1.5% dimensional deviation on a 150 mm length when printed with a heated bed at 100 °C.

Compared with polycarbonate filament, AM3300 processes at nozzle temperatures approximately 30 °C to 40 °C lower, reducing the risk of additive degradation and expanding compatibility with standard PTFE-lined hot ends. However, the heat deflection temperature under 1.82 MPa is approximately 20 °C lower than that of a typical unfilled polycarbonate. Compared with PLA, AM3300 offers higher service temperature and higher impact resistance but requires a heated bed and enclosure for consistent interlayer adhesion. In assembly fixtures used near 60 °C ambient air, AM3300 maintains dimensional stability better than PLA and avoids the styrene odor of ABS. Continuous load-bearing use above 70 °C is not recommended without creep testing per ASTM D2990, because amorphous copolyesters can exhibit measurable creep under sustained stress at elevated temperature.

Thermal degradation becomes measurable above 280 °C and 0.05 % moisture

Thermo-oxidative degradation in AM3300 becomes measurable at melt temperatures above 280 °C. Exposure longer than 10 min at 290 °C can produce surface yellowing and a measurable decline in Charpy impact strength. Use of nitrogen purge on extrusion hoppers is not standard, but it can reduce oxidative degradation during long production runs. Feedstock with moisture above 0.05% by weight can show more than 15% reduction in melt viscosity, a shift that may be misinterpreted as a change in molecular weight. This behavior has been observed on single-screw extruders with 24:1 L/D and 3 mm rod dies, where wet pellets produced filament diameter fluctuations exceeding ±0.05 mm. Moisture analysis by Karl Fischer titration per ISO 15512:2019 is therefore recommended before extrusion at relative humidity above 60%.

Printed parts intended for outdoor service require ultraviolet stabilization because the unfilled copolyester is not inherently UV-stable. Weathering programs per ISO 4892-2:2013 may be required to establish application-specific retention of tensile properties and color change. Users should avoid combination with amine-based additives unless specifically evaluated, because basic nitrogen-containing species can accelerate hydrolysis in polyester matrices at processing temperatures. The operational boundary for AM3300 is therefore defined by moisture control below 0.03%, melt temperature at or below 270 °C, and continuous load-bearing service below 70 °C unless creep-resistant design allowances are verified by end-use testing.