Polymaker PETG Galaxy Blue: problems, parts and running costs

Checked: 2026-10-26

Summary

Polymaker PETG Galaxy Blue is a hygroscopic high-speed PETG spool whose most reported issues are stringing and wet-filament popping, overly strong bed adhesion, and shattering when dropped. Running costs are limited to electricity for occasional drying at 60 C for 6 h plus an occasional nozzle, with no subscription or proprietary consumable. It is a good buy at $20 per kg or less, and still reasonable at $21-25 per kg.

Common problems and fixes

Stringing and oozing — inherent to PETG; reported across owner discussion. Fix with retraction of 1-3 mm at 20-40 mm/s and dry filament. [1][2]
Wet filament (popping, rough surface, weak bonding) — hygroscopic spool absorbs moisture; dry at 60 C for 6 h, and sealed storage does not reverse absorbed moisture. [1][2]
Bed adhesion too strong on bare glass or PEI — parts can be hard to remove; use textured PEI or a release agent and let the part and bed cool to room temperature first. [1][6]
Shattering when dropped — PETG has lower impact resistance than some engineering materials. [6]
Galaxy glitter clogging nozzles under 0.4 mm — manufacturer states glitter will not clog 0.4 mm or larger nozzles, but this is a manufacturer statement, not an independent clog test. [1]
Unverified strength and flow claims — no independent instrumented test of this formula or color exists; tensile and flow figures are manufacturer data. [4][6]

Parts and consumables

No replaceable parts or consumables reported.

Yearly running cost

Not enough data to put a dollar figure on a typical year. The only recurring items are electricity for occasional drying (60 C for 6 h per wet spool), desiccant and storage, and an occasional nozzle replacement; there is no proprietary filament lock-in (standard 1.75 mm) and no subscription. [1][2][4]

When it is a good buy

Manufacturer positions the formula under $20 per kg worldwide. [4] An aggregator lists Galaxy Blue at $24.99 (snapshot, not a verified checkout price). [3] At $20 per kg or less it is strong value (300 mm/s capability, 47.96 MPa tensile, AMS compatibility, no enclosure, 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. Choose PolyLite PETG (older Polymaker formula, about 50 MPa in one third-party test) when you want a simpler, lower-cost PETG and do not need the high-flow speed. Budget PETG under about $16 per kg may have inconsistent diameter or moisture issues. [4][6]