PCTG is a tougher, clearer cousin of PETG. It prints with almost the same settings, but handles drops, impacts and chemicals better, strings less, and comes off the printer with a cleaner finish. If you already print PETG, PCTG is the easiest material upgrade you can make.
Below we cover what PCTG actually is, how it compares to PETG and PLA, what it's good for, and how to dial it in on your printer, including Bambu Lab printers with the AMS.
What Is PCTG?
PCTG stands for polycyclohexylenedimethylene terephthalate, glycol-modified. That's a mouthful, so here's the short version: PCTG and PETG are both copolyesters, the same family of plastics used in water bottles and food containers. The difference is in the recipe.
In PETG, a little of the ethylene glycol in the polymer is swapped for a molecule called CHDM (cyclohexanedimethanol). In PCTG, more than half of it is CHDM. That bigger share of CHDM makes the plastic chains more resistant to cracking, which gives PCTG its main advantages:
- Higher impact strength. PCTG flexes and absorbs a hit where PETG is more likely to crack or snap.
- Better chemical resistance. It holds up better against cleaners, oils and solvents.
- Excellent clarity. Clear and translucent PCTG prints with very little haze.
- Cleaner printing. Less stringing and oozing than most PETG.
PCTG vs PETG vs PLA
| PLA | PETG | PCTG | |
|---|---|---|---|
| Ease of printing | Easiest | Easy | Easy (PETG-like settings) |
| Impact strength / toughness | Low (brittle) | Good | Excellent |
| Heat resistance | Low (softens ~55–60°C) | Good | Good (similar to PETG) |
| Chemical resistance | Low | Good | Better |
| Stringing | Minimal | Can be stringy | Reduced |
| Clarity (clear grades) | Fair | Good | Excellent |
| Best for | Models, prototypes, décor | General functional parts | Parts that get dropped, flexed, cleaned or handled hard |
Bottom line: PLA is great for looks and fast prototypes. PETG is a solid all-rounder. PCTG is what you reach for when a part has to survive real-world abuse.
What Is PCTG Good For?
- Jigs, fixtures and shop tools that get knocked around on the bench
- Snap-fit parts and clips that need a little give without breaking
- Enclosures and housings for electronics, sensors and outdoor gear
- Brackets, mounts and replacement parts for cars, bikes, appliances and RVs
- Lamp shades, light diffusers and display pieces using clear or translucent PCTG
- Parts that get wiped down with cleaners or come into contact with oils
How to Print PCTG
If you can print PETG, you can print PCTG. Start with your PETG settings and adjust from there. Here are the starting points we recommend for Atomic PCTG PRO:
- Nozzle temperature: 255–272°C
- Bed temperature: about 80°C (±10°C)
- Cooling fan: low to moderate. Too much fan can weaken layer bonding.
- Bed surface: textured PEI works great. On smooth PEI or glass, use a Bed Bond or glue stick so the part doesn't bond too well.
- Enclosure: not required.
- Drying: like all copolyesters, PCTG absorbs moisture from the air. If you see stringing, bubbles or a rough surface, dry the spool before printing and store it in a sealed bin with desiccant.
PCTG on Bambu Lab printers and the AMS
Every Atomic PCTG PRO spool is Bambu AMS compatible, so it loads and feeds just like your other AMS spools. In Bambu Studio, start from a generic PETG or PCTG profile, set the nozzle to the range above, and tune from there.
What Is PCTG-CF (Carbon Fiber PCTG)?
PCTG-CF is PCTG blended with chopped carbon fiber. The fibers make parts stiffer and give them a matte, slightly textured finish that hides layer lines. It's a favorite for drone parts, brackets, tooling and anything that should look technical.
Carbon fiber is abrasive, so print PCTG-CF with a hardened steel or other wear-resistant nozzle. A standard brass nozzle will wear out quickly.
Shop Carbon Fiber Extreme Black PCTG PRO.
Clear PCTG
Clarity is one of PCTG's best features. Our Crystal Clear / Natural PCTG PRO prints with very little haze, which makes it a great choice for light diffusers, lamp shades, display cases and parts where you want to see inside. For a tinted look, try Translucent Smoke Black PCTG PRO.
Tip for maximum clarity: print slower, use a slightly higher nozzle temperature, a wider extrusion width and 100% infill (or vase mode), so there are fewer internal gaps to scatter light.
American-Made PCTG Filament
Atomic PCTG PRO is made in Indiana, USA, using the same premium pigments as our PETG PRO line, with industrial extrusion and laser-based quality control on every spool. You get:
- 1.75 mm diameter, held to ±0.02 mm
- 1 kg spools in more than 20 colors, plus 3.5 kg jumbo spools
- Bambu AMS compatible spools
- $2 credit for each empty Atomic spool you return through our Spool Return Program
Popular colors include Extreme JET Black, Bright White, Gun Metal Gray, Marble and Cosmic Graphite.
Not sure yet? Try a PCTG sample bundle or one of our sample coil packs before committing to a full spool.
PCTG FAQ
Is PCTG better than PETG?
For most functional parts, yes. PCTG is tougher, more chemical resistant and strings less, while printing with nearly the same settings. PETG is still a great general-purpose material and is often a little cheaper.
Can I use my PETG settings for PCTG?
Yes, that's the best starting point. Most people end up running PCTG a few degrees hotter than PETG. Our recommended range is 255–272°C nozzle and about 80°C bed.
Does PCTG need an enclosure?
No. PCTG warps very little and prints well on open-frame printers.
Is PCTG heat resistant?
PCTG's heat resistance is similar to PETG's and much better than PLA's. It handles warm spaces like a garage or the inside of an electronics enclosure, but for parts that sit in direct sun or high heat, like car dashboard parts, consider ASA, ABS or nylon.
Is PCTG food safe?
PCTG resin is used in food containers, but a 3D-printed part isn't automatically food safe. Layer lines can trap bacteria, and colorants and nozzles can add contaminants. We don't recommend using printed parts for food or drink without a food-safe coating.
Does PCTG need to be dried?
PCTG absorbs moisture over time like PETG. Store it sealed with desiccant, and dry it if you notice extra stringing, popping or a rough surface.
What does PCTG stand for?
Polycyclohexylenedimethylene terephthalate, glycol-modified. It's a copolyester in the same family as PETG.