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Polymaker PETG Galaxy Blue

Polymaker PETG Galaxy Blue

By Polymaker · Filament & Resin · 3D Printing · More from Polymaker

  • 1.75mm diameter
  • 1 kg spool
  • Print temp 240-260 C
  • Bed temp 60-70 C
  • Speed up to 300 mm/s (500 mm/s high-flow)

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Problems, parts and running costs

Summary

Polymaker PETG Galaxy Blue is a 1.75 mm, 1 kg spool of Polymaker’s current high-speed PETG formula in a dark blue glitter color, aimed at functional parts that need more toughness and heat resistance than PLA. Check your nozzle size and moisture control before buying: the Galaxy glitter is rated only for 0.4 mm or larger nozzles, and the filament is hygroscopic.

Strengths

  • High-flow formula: up to 300 mm/s (over 500 mm/s high-flow) with 22-32 mm3/s volumetric flow, no enclosure needed.
  • Documented mechanical data: 47.96 MPa tensile, HDT 69 C, density 1.30 g/cm3.
  • AMS-compatible spool with hardened edges; no proprietary filament lock-in (standard 1.75 mm).
  • Galaxy glitter rated not to clog 0.4 mm or larger nozzles.
  • Manufacturer positions the formula under $20 per kg with vivid Galaxy colors.

Weaknesses

  • No independent instrumented test of this exact formula or color exists; available data covers older PolyLite PETG.
  • Hygroscopic: wet spools string, pop and bond weakly; drying required.
  • Bed adhesion can be too strong on bare glass or PEI; needs textured PEI or release agent.
  • Not FDA food-safe; heat resistance limited (HDT 69 C).
  • Warranty duration not stated in the sources read.

Verified specifications

MaterialPETG (Polyethylene Terephthalate Glycol).
Diameter1.75 mm.
Spool weight1 kg (1000 g).
Empty spool weight140 g.
ColorGalaxy Blue, RGB #012C61.
Manufacturer SKUPB05023. UPC/EAN: 6938936717935.
Nozzle temperature240-260 C.
Build plate temperature60-70 C.
Cooling fan20-60%.
Printing speedup to 300 mm/s.
Max speed with high-flow nozzleover 500 mm/s.
Max volumetric speedup to 22 mm3/s (up to 32 mm3/s with high-flow hotend).
Retraction distance1-3 mm.
Retraction speed20-40 mm/s.
Enclosurenot needed.
AMS compatibleyes (hardened spool edges).
Drying60 C for 6 h.
Density1.30 g/cm3 at 23 C.
Melt index16.3 g/10 min at 230 C, 2.16 kg.
Glass transition temperature71.24 C.
Vicat softening temperature75 C.
Heat deflection temperature69 C at 0.45 MPa; 65 C at 1.8 MPa.
Decomposition temperature405.49 C.
Max water absorption0.51%.
Tensile strength47.96 MPa (X-Y), 45.71 MPa (Z).
Young's modulus2311.11 MPa (X-Y), 2202.91 MPa (Z).
Elongation at break9.33% (X-Y), 3.54% (Z).
Bending strength80.08 MPa (X-Y), 57.65 MPa (Z).
Bending modulus2277.34 MPa (X-Y), 1958.74 MPa (Z).
Charpy impact, notched4.95 kJ/m2 (X-Y).
Charpy impact, unnotched20.24 kJ/m2 (X-Y), 15.74 kJ/m2 (Z).
Chemical resistancegood to weak acids, oils and grease; fair to weak alkalis; poor to strong acids and strong alkalis.
Food safetynot FDA food-safe (per manufacturer FAQ).
UV and watersuitable for outdoor use; prolonged exposure may degrade some properties.
Galaxy glitterwill not clog nozzles of 0.4 mm or larger (manufacturer tested).
Textured PEIusable, but cool part and bed to room temperature before removal; release agent recommended.
Full research notes and sources

Polymaker’s technical data sheet calls for a 240-260 C nozzle, a 60-70 C bed, and 20-60% fan, with retraction of 1-3 mm at 20-40 mm/s. Speed is rated up to 300 mm/s, or over 500 mm/s with a high-flow nozzle, with max volumetric flow of 22 mm3/s (up to 32 mm3/s with a high-flow hotend). No enclosure is needed and the spool is AMS-compatible through hardened spool edges. The headline 300 mm/s is a ceiling, not a guarantee; usable speed depends on hotend melt capacity, line width, layer height, acceleration, and cooling.

Strength, heat and chemical resistance

Manufacturer figures, not independent measurements: density 1.30 g/cm3, Tg 71.24 C, HDT 69 C at 0.45 MPa (65 C at 1.8 MPa), Vicat softening 75 C, tensile 47.96 MPa (X-Y) / 45.71 MPa (Z), impact 4.95 kJ/m2 notched. Polymaker’s blog claims 47% higher impact strength and 14% higher bending strength than traditional PETG. Chemical resistance is good to weak acids, oils and grease; fair to weak alkalis; poor to strong acids and strong alkalis. Not FDA food-safe. Suitable for outdoor use, though prolonged exposure may degrade some properties.

Moisture, stringing and bed adhesion

PETG is hygroscopic; wet spools produce popping, excess stringing, rough surfaces and weak bonding. Dry at 60 C for 6 h if symptoms appear; sealed storage does not reverse absorbed moisture. Keep spools sealed with desiccant; PolyBox or PolyDryer for storage and printing. Bed adhesion can be too strong on bare glass or PEI; use textured PEI or a release agent and cool the part to room temperature before removal. PETG can shatter when dropped.

Galaxy glitter and nozzle wear

Galaxy Blue contains glitter particles; the manufacturer states these will not clog nozzles of 0.4 mm or larger, based on their own large-print testing. That is a manufacturer statement, not an independent clog test. Brass nozzles are adequate for standard PETG; abrasive additives need hardened nozzles, and Galaxy glitter is not listed as abrasive. Clean the nozzle and use a nozzle sock to reduce buildup.

Is it worth it?

Manufacturer positions the formula under $20 per kg worldwide; an aggregator lists Galaxy Blue at $24.99 (snapshot, not a verified checkout price). At $20 per kg or less, the formula offers strong value: 300 mm/s capability, 47.96 MPa tensile, AMS compatibility, no enclosure, and vivid colors. At $21-25 per kg, still good value for a high-flow, low-warp PETG with documented mechanical data. Above $25 per kg, the Galaxy color premium is cosmetic unless the color is required. Budget PETG under about $16 per kg may have inconsistent diameter or moisture issues.

Which model this is

This is a color variant of Polymaker’s current high-speed PETG formula, sold as a 1.75 mm, 1 kg spool under SKU PB05023 (UPC/EAN 6938936717935, RGB #012C61). It is not PolyLite PETG, PolyMax PETG, or other Polymaker PETG-based products, which use different formulas. No separate model or revision numbers are published for individual colors. The Amazon listing for this color is ASIN B0FNDKP2SW.

Sources

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