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ASA vs PETG: strength, heat and cost

ASA starts to bend under load at 100 °C and PETG at 71 °C. Compare strength, print settings, drying and price per gram from Bambu Lab's datasheets.

Which to choose

Choose ASA for sun and heat: Bambu Lab sells it for long outdoor exposure, and it holds its shape at a far higher temperature than PETG. Choose PETG for load and for cost: it is stronger in tension in both directions, costs much less per gram and prints in a cooler chamber.

Side by side

ASABambu Lab TDSPETGBambu Lab TDS
Heat deflection100 °C71 °C
Tensile strength, along layers37 MPa51 MPa
Tensile strength, across layers31 MPa35 MPa
Impact strength, along layers41 kJ/m²34.2 kJ/m²
Impact strength, across layers4.9 kJ/m²10.5 kJ/m²
Water absorption0.45%0.45%
Price per gram$0.030$0.014
Length per kilogram396 m333 m
Nozzle240–270 °C230–260 °C
Bed80–100 °C65–75 °C
Chamber45–60 °C35–50 °C
Drying80 °C, 8 h65 °C, 8 h

Every figure is from Bambu Lab’s own datasheets, because one lab’s tests compare with each other and two labs’ tests may not. In bold is the side ahead on that row. Other makers’ settings are in the temperature chart, and any other pair is in the filament comparison.

Each material in full

Other comparisons

Keep these numbers for every print

Printyard runs this arithmetic on your phone at the machine and on the web: every quote itemised, every roll to the gram, and a month with the fees and the failed prints already taken out.

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Sources