PETG Filament Complete Guide: Settings, Tips, and When to Use It

What Is PETG?

PETG (Polyethylene Terephthalate Glycol-modified) is a thermoplastic that sits between PLA and ABS in terms of difficulty and performance. It combines much of PLA's ease of printing with ABS's durability and heat resistance. It's the same polymer family used in drink bottles and food containers, which gives it excellent chemical resistance and clarity.

At Forgely Roy, PETG is one of our most recommended materials for functional prints. We manufacture PETG filament locally and stock it in a wide range of colors. If you've been printing only PLA, PETG is the logical next step.

PETG Properties

• Heat resistance: Glass transition around 80°C — significantly better than PLA's 55–60°C
• Impact resistance: Excellent. PETG bends rather than shattering
• Chemical resistance: Resists most common chemicals, oils, and solvents
• UV resistance: Better than PLA and ABS for outdoor applications
• Layer adhesion: Very strong — PETG parts rarely delaminate
• Flexibility: Slight flex compared to rigid PLA, reducing brittleness
• Transparency: Available in translucent and clear options

When to Use PETG Instead of PLA

Use PETG when your print needs to:

• Survive outdoor exposure (planters, garden stakes, mailbox parts)
• Handle mechanical stress (brackets, clips, functional parts)
• Resist heat (car interior parts, items near heat sources)
• Contact water or chemicals (aquarium parts, plumbing adapters)
• Be food-adjacent (with proper precautions — see our food-safe printing guide)

Stick with PLA when you prioritize surface finish, ease of painting, fine detail, or when the part is purely decorative.

When to Use PETG Instead of ABS

PETG replaces ABS in most applications. It doesn't require an enclosure, doesn't produce toxic fumes, warps far less, and has comparable mechanical properties. ABS still wins for parts that need to be acetone-smoothed or that operate at very high temperatures, but for 90% of functional prints, PETG is the better choice.

Recommended Print Settings

Temperature

• Nozzle: 230–250°C (start at 240°C and adjust)
• Bed: 70–85°C (80°C is the sweet spot for most)

Speed

PETG prints well at 40–60mm/s. It can go faster on modern printers, but stringing worsens at higher speeds. For quality-critical prints, slow down to 40mm/s.

Retraction

This is where PETG gets tricky. PETG is stringy by nature. Retraction settings are critical:

• Direct drive: 1–3mm retraction distance, 25–40mm/s retraction speed
• Bowden: 4–6mm retraction distance, 35–50mm/s retraction speed

Cooling

Unlike PLA (which wants maximum cooling), PETG prefers moderate cooling — 30–50% fan speed. Too much cooling causes poor layer adhesion. Too little causes drooping on overhangs. Start at 40% and adjust based on your results.

Bed Adhesion

PETG sticks aggressively to bare glass and some PEI surfaces. Use a glue stick, hairspray, or Wham Bam-style flexible build plates. On textured PEI, PETG usually releases cleanly. On smooth PEI, it can bond permanently and damage the surface — always use a release agent on smooth PEI.

Fixing PETG Stringing

Stringing is the number one complaint with PETG. Here's a systematic approach to reducing it:

• Dry your filament: Wet PETG strings much worse than dry PETG. Dry at 65°C for 4–6 hours.
• Lower the temperature: Drop nozzle temp by 5°C increments. Find the lowest temp that still gives good layer adhesion.
• Increase retraction: Add 0.5mm at a time until stringing improves.
• Enable wipe: Most slicers have a "wipe" setting that drags the nozzle across the print after retraction, cleaning the tip.
• Z-hop cautiously: Z-hop can increase stringing with PETG. Try disabling it.
• Reduce flow rate: PETG can be slightly over-extruded at default settings. Try 95–97% flow.

Some stringing is nearly unavoidable with PETG. Minor strings can be removed with a heat gun (quick pass at low setting) or a lighter (fast wave — don't melt the part).

Best PETG Colors and Applications

PETG excels in translucent colors that PLA can't match. Clear, translucent blue, green, and red PETG are stunning for lamp shades, light diffusers, and decorative pieces. Solid colors work great for functional parts. Black PETG is a workshop staple for brackets, mounts, and enclosures.

Get PETG at Forgely Roy

We manufacture and stock PETG in a full range of colors at our Roy, Utah location. Our staff can help you dial in settings for your specific printer and recommend the right PETG variant for your project.

📍 Forgely Roy — 5519 S 1900 W, Roy, UT 84067
📞 385-449-2694
⏰ Mon–Fri 11–6 • Sat 11–3