PPA vs PLA
Compare PPA and PLA filaments side-by-side so you can pick the right one for your 3D printing project.
PPA
CPolyphthalamide
Semi-aromatic nylon: aromatic rings in the backbone push Tg to ~130C and the melting point to ~300C
PLA
APolylactic Acid
Easiest to print, cheap, widely available, fast, good bridges/overhangs, easy support removal
Detailed Comparison
Property
PPA
PLA
Tier Rating
Tier C
Tier A
Family
Nylon (PA)
PLA
Nozzle Temp
280-310°C
190-220°C
Bed Temp
100-120°C
50-60°C
Enclosure
required
not needed
Cooling
Minimal
High part cooling usually beneficial
Moisture Sensitivity
high
moderate
Green marks the generally easier or more forgiving option in that row, based on tier, enclosure needs, and moisture sensitivity. It is not always the better choice for a specific job, so weigh it against what your project actually needs.
Strengths Comparison
PPA Strengths
- Semi-aromatic nylon: aromatic rings in the backbone push Tg to ~130C and the melting point to ~300C
- Holds strength, stiffness and dimensions at temperatures where PA6, ABS and PETG soften
- Strong resistance to oils, greases, fuels and industrial chemicals
- Absorbs far less moisture than PA6, so properties stay consistent in humid air
PLA Strengths
- Easiest to print, cheap, widely available, fast, good bridges/overhangs, easy support removal
- Stiff non-composite thermoplastic, good tensile strength
Considerations
PPA Caveats
- Needs a ~300C-capable all-metal hotend and an enclosure, which rules out most desktop printers
- Unfilled PPA is usually the wrong buy: most commercial 3D printing PPA is sold carbon- or glass-filled
- Expensive, and demanding drying (roughly 100-140C) before every print
PLA Caveats
- Creeps under sustained load
- Poor heat resistance, UV degradation, can shatter on drops
- Not great for sanding/gluing/painting/touch-ups
Frequently Asked Questions
Is PPA or PLA better for 3D printing?
PLA is generally rated higher (Tier A) compared to PPA (Tier C). However, the best choice depends on your specific needs: PPA is best for Semi-aromatic nylon: aromatic rings in the backbone push Tg to ~130C and the melting point to ~300C, while PLA is best for Easiest to print, cheap, widely available, fast, good bridges/overhangs, easy support removal.
What are the temperature differences between PPA and PLA?
PPA prints at 280-310°C nozzle / 100-120°C bed. PLA prints at 190-220°C nozzle / 50-60°C bed.
Do PPA and PLA need an enclosure?
PPA: required. PLA: not needed.
Which is more beginner-friendly: PPA or PLA?
PLA is more beginner-friendly as it doesn't require an enclosure.