PPA vs PLA
Compare PPA and PLA filaments side-by-side so you can pick the right one for your 3D printing project.
PPA vs PLA: PPA is known for semi-aromatic nylon: aromatic rings in the backbone push..., while PLA is known for easiest to print. PLA is easier to print; PPA prints at higher nozzle temperatures (280-310°C vs 190-220°C). Choose PPA for semi-aromatic nylon: aromatic rings in the backbone push..., or PLA for easiest to print.
Key differences at a glance
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
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