PETG vs PLA: Which 3D Printing Filament Should You Use?

PLA and PETG are the two most commonly used 3D printing filaments, and for most jobs, they're the only two you need to consider. But choosing between them isn't always straightforward — each has distinct advantages depending on what you're printing and how it will be used. Let's compare them head to head.

Printability

PLA wins on ease of printing. It has a wide temperature window (190–220°C), minimal warping, excellent bridging performance, and works reliably on almost any FDM printer. You can print PLA without a heated bed, without an enclosure, and with minimal tuning. PETG is slightly more demanding — it prints at higher temperatures (220–250°C), requires a heated bed (70–80°C), and tends to string more than PLA. Getting clean PETG prints requires dialling in retraction settings and potentially adjusting travel speeds. That said, modern printers with good retraction handle PETG quite well.

Mechanical Properties

This is where PETG pulls ahead. PETG is more ductile than PLA — it bends before it breaks, while PLA tends to snap. This makes PETG significantly better for parts under stress, impact loads, or vibration. PETG also has better temperature resistance (softens around 80°C vs 60°C for PLA), making it suitable for parts in warm environments or near heat sources. For brackets, clips, enclosures, and mechanical components, PETG is almost always the better choice.

Surface Finish and Detail

PLA produces a slightly better surface finish and handles fine details more precisely. If you're printing miniatures, architectural models, or display pieces where visual quality is paramount, PLA delivers cleaner results. PETG has a slightly glossy, sometimes uneven surface that doesn't take paint as easily as PLA's matte finish. For visual models and prototypes where appearance matters more than function, PLA is the better option.

Cost and Availability

Both materials are widely available and similarly priced — typically $25–$40 AUD per kilogram for quality brands. PLA has a slight edge in variety, with more colour options and specialty variants (silk, matte, marble) available. PETG is available in fewer colours but the standard range covers most production needs. Neither material is significantly more expensive than the other, so cost shouldn't be a deciding factor.

When to Use Each

• Choose PLA for: Prototypes, display models, cosplay props, miniatures, low-stress decorative parts, learning and experimentation
• Choose PETG for: Functional parts, outdoor use, mechanical components, food-safe applications (check specific brand certifications), parts that need impact resistance
• Consider both: If a part needs to look good AND be functional, print a PLA prototype for visual approval then produce the final in PETG

For 3D printing businesses, stocking both PLA and PETG in a core range of colours covers 80–90% of customer requests. Knowing which to recommend for each application builds trust and ensures your customers get parts that perform as expected.