Spectrum's PCTG Premium filament is an ideal alternative to PET-G. This filament prints just as easily as PET-G, but offers improved impact resistance, high stability, and minimal shrinkage. PCTG has an HDT of 76°C, higher elasticity, and high chemical resistance. 3D prints made with Spectrum Premium PCTG transparent colors can achieve an almost completely transparent effect. You don't need a heated print chamber to 3D print with this filament. The filament is 1.75 mm, comes in Traffic Black, and weighs 1 kg on the spool.