Which is better for a fast printer like a Bambu Lab or K1?

The Sunlu. It is rated to 600 mm/s and lists AMS compatibility, while the IEMAI tops out at 150 mm/s.

Is the Sunlu worth the switch if I already use the IEMAI?

Yes if speed or price matters. The Sunlu is $3.70 cheaper at Amazon as of November 4, 2026, and prints far faster. Stay with the IEMAI if your profiles are tuned and you want the cooler 60-70°C bed.

Which has better mechanical strength?

Only Sunlu publishes numbers: tensile 46±5 MPa, flexural 75±6 MPa, impact 3±1.5 kJ/m². The IEMAI lists no mechanical specs, so there is nothing to compare.

Which is easier to print on a stock printer?

The IEMAI, because its 60-70°C bed and 230-270°C nozzle range fit more default profiles. The Sunlu wants a bed at 70-80°C.

Do both come on 1 kg 1.75 mm spools?

Yes. Both are 1 kg spools at 1.75 mm with ±0.02 mm diameter tolerance.

Which lasts longer in use?

PETG parts from either hold up to about 70°C; Sunlu lists a heat deflection temperature of 70±2°C. The IEMAI gives no figure, so Sunlu is the safer bet for warm or load-bearing parts.

IEMAI Matte PETG Filament 1.75mm, 1kg Gray vs Sunlu PETG High Speed Matte Filament GREY 1.75mm 1kg

Buy the Sunlu if you print fast or want the lowest price: it is $13.29 at Amazon as of November 4, 2026, versus $16.99 at Amazon for the IEMAI. The IEMAI runs at ordinary speeds (≤150 mm/s) and needs a cooler bed, so it suits standard printers and slower, detail-focused work. The Sunlu is the better all-round pick for most shoppers; the IEMAI only wins if you want a slower, cooler-running profile.

Today the Sunlu PETG High Speed Matte Filament GREY 1.75mm 1kg costs $3.70 less at its best price.

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