Filament Guide

PCTG Filament Guide

PETG's tougher, clearer cousin. Easier than it sounds.

Last updated: March 2026

PCTG
Polycyclohexanedimethylene Terephthalate Glycol
PETG's tougher, clearer cousin. Easier than it sounds.
Beginner-Intermediate Growing

PCTG is a copolyester closely related to PETG but with a different glycol modifier - cyclohexanedimethanol (CHDM) instead of ethylene glycol. This swap gives PCTG significantly higher impact resistance, better optical clarity, and improved toughness compared to PETG, while keeping the same user-friendly print characteristics.

Available from manufacturers like Extrudr, 3DJake, and Fiberlogy. PCTG bridges PETG and engineering materials — nearly as printable as PETG, but tougher, without ABS fumes or warping.

Main downsides: fewer suppliers than PETG and slightly higher cost. If you've been printing PETG and want tougher parts without changing your setup, PCTG is the logical next step.

Chemistry
Copolyester - PET modified with CHDM glycol (cyclohexane ring adds toughness)
Print Temp
Nozzle: 230-260°C
Bed: 70-85°C [1]
Heat Resistance
Softens at ~85°C - slightly better than PETG
vs PETG
~2-3x impact strength, better clarity, less brittleness at low temps [2]
Optical Clarity
Excellent - clearer than PETG in transparent grades, approaching PC
Availability
Growing but still niche - fewer color options than PETG
Pros
  • Much higher impact resistance than PETG
  • Better optical clarity for transparent parts
  • Tougher at low temperatures - doesn't get brittle in cold
  • Prints almost identically to PETG - same profiles work
  • Very low warping - no enclosure needed
  • Food-contact approved grades exist (base resin level)
Cons
  • Less widely available than PETG
  • Higher price - typically 30-50% more than PETG
  • Fewer color options from most brands
  • Still strings like PETG - retraction tuning needed
  • Similar moisture sensitivity to PETG

Best Used For

Impact-resistant housings Clear light covers Snap-fit enclosures Cold-weather parts Protective cases Medical device prototypes

Niche Tips

Use your PETG profile as a starting point. PCTG prints at the same or slightly higher temperatures. Most users find their PETG retraction and speed settings work with minimal adjustment - maybe 5°C hotter on the nozzle.
Clarity trick: For maximum transparency, print at the higher end of the temp range (250-260°C), slow speed (30-40mm/s), 0.1mm layers, and minimal cooling. The results rival injection-molded clear parts.
PCTG's improved impact strength makes it a strong contender for phone cases, tool handles, and anything that gets dropped regularly - applications where PETG would crack.

Storage & Humidity

Target: below 25% RH. Same moisture behavior as PETG. Absorbs moisture at a moderate rate and shows stringing and surface quality degradation when wet.
Drying: 65°C for 4-6 hours. Identical to PETG - the copolyester family shares similar thermal and moisture characteristics.

Bed Adhesion

Best surfaces: Textured PEI with glue stick, glass with hairspray. Same caution as PETG - use a release agent on smooth PEI to prevent surface damage.
Recommended bed temp: 70-85°C. Identical to PETG. Same release behavior - wait for full cool-down before removing parts.

References

  1. Bambu Lab Wiki - Filament Guide Material Table. Print temperatures and material properties for common filaments. wiki.bambulab.com/en/general/filament-guide-material-table
  2. Simplify3D - Filament Properties Table. Mechanical property comparisons across filament types. simplify3d.com/resources/materials-guide/properties-table
← All materials Browse PCTG on SpoolHound
Related Materials
RELATED
PETG — more affordable standard option ABS — if you need heat resistance

Frequently Asked Questions

Is PCTG better than PETG?
PCTG is a glycol-modified copolyester with better impact resistance, clarity, and chemical resistance than standard PETG. It also tends to string less. However, PCTG is more expensive and less widely available. For most users, PETG is sufficient. PCTG is worth it for parts requiring superior toughness or optical clarity.
Is PCTG food safe?
PCTG has food-contact approval in its raw form and is used in commercial food packaging. Some PCTG filament brands carry food-contact certifications. As with all FDM prints, the layer lines create bacterial harbors that make printed parts difficult to sterilize fully. Seal with a food-safe coating for repeated food contact use.
What temperature does PCTG print at?
PCTG typically prints at 230-260°C nozzle temperature, slightly higher than PETG (220-250°C). Bed temperature is 70-85°C. PCTG is more forgiving than PETG with stringing at these temperatures. Start at 240°C and adjust based on layer adhesion and surface quality.