Filament Spectrum PCTG 1 kg — Grey (Iron Grey), 200 mm/s print speed, 67 mm width

Spectrum Premium PCTG filament in Iron Grey is a thermoplastic filament for FDM/FFF 3D printing supplied on a single 1 kg reel. Designed as an alternative to PET-G, this PCTG material combines ease of printing with increased impact strength, good dimensional stability and low shrinkage. The filament is suitable for functional prototypes, mechanical parts and visual models that require a balance of strength and surface quality. The specified maximum print speed is 200 mm/s and the reel has a width of 67 mm; the manufacturer lists a density of 0.00123 kg/m³. PCTG offers a heat deflection temperature of 76°C, higher elasticity than some PLA variants, and good chemical resistance for printed parts.

Advantages

Spectrum Premium PCTG provides higher impact resistance compared with premium PET-G while remaining easy to print and finish. Transparent colour variants yield better clarity, enabling near-transparent results with minimal post-processing. The material shows low shrinkage and high dimensional accuracy, producing parts with consistent geometry and a smooth surface finish. PCTG prints are hydrophobic and odourless, and the filament does not require a heated build chamber for reliable results under typical desktop printer conditions.

Suitable for

• Functional prototypes and proof-of-concept models
• Mechanical parts and housings subject to impact or stress
• Visual models and display pieces requiring a smooth surface
• Transparent or translucent components where higher clarity is desired (transparent colours)
• Parts exposed to mild chemicals or humid environments

Key specifications

• Material: PCTG copolyester
• Colour: Iron Grey (grey)
• Reel weight: 1 kg
• Recommended maximum print speed: up to 200 mm/s
• Reel width: 67 mm
• Heat deflection temperature: 76°C
• Properties: increased impact strength, low shrinkage, high dimensional stability, hydrophobic and odourless
• Surface finish: smooth, good clarity in transparent variants

How to use

Load the 1 kg Spectrum PCTG filament onto a compatible FDM/FFF printer spool holder ensuring the filament feeds smoothly through the filament path. Use a nozzle temperature and bed temperature appropriate for PCTG on your printer model, calibrate extrusion and retraction to reduce stringing, and set layer height and print speed according to required surface quality and strength. While a heated build chamber is not required, a heated bed and proper first-layer adhesion improve dimensional accuracy. Allow printed parts to cool sufficiently before post-processing or mechanical assembly.

Usage recommendations

For best results, start with moderate print speeds and adjust toward the specified maximum as you validate extrusion and cooling. Use drying if the filament has been stored in humid conditions. When printing transparent or translucent variants, reduce the number of outer contours and increase extrusion flow to enhance clarity. Avoid prolonged exposure of printed parts to temperatures near the material's heat deflection temperature to maintain mechanical properties.