Which is better for high-speed printing?

The Sunlu. It is rated to 600 mm/s and its melt flow index of 4.4±2 g/10 min is set up for fast extrusion. The Prusament has no high-speed rating, so print it at standard PETG speeds.

Is the Prusament worth the extra $23.70?

Only if you need documented consistency. The QR code lets you check the measured diameter and properties of your spool, which matters for production parts and repeatable color. For general printing, the Sunlu does the job for less.

The Sunlu publishes tensile strength of 46±5 MPa and flexural strength of 75±6 MPa, but elongation at break is only 14±5%, so it is stiff rather than flexible. Prusament does not publish figures, so there is no direct number to compare.

Which handles heat better?

The Sunlu's heat deflection temperature is 70±2 °C, which is typical for PETG. Prusament calls its PETG high-temperature resistant but gives no figure, so treat them as similar until you test.

Will either work in a Bambu Lab AMS?

The Sunlu is listed as AMS compatible. Prusament spools are standard 1 kg plastic spools and generally fit, but check your AMS clearance before buying.

Which has more consistent color?

Prusament, which tests color consistency during manufacturing and prints the same batch. The Sunlu matte grey has no batch-to-batch color guarantee.

Prusament PETG 1.75mm 1kg Spool - Matte Grey vs Sunlu PETG High Speed Matte Filament GREY 1.75mm 1kg

Buy the Sunlu if you print fast on a modern printer and want a matte finish for the lowest cost: $13.29 at Amazon as of November 4, 2026, against $36.99 at WoodArtSupply for the Prusament. Buy the Prusament if you want documented, spool-level quality control and predictable color, and you print at normal speeds. The price gap is about $23.70 per spool, so the Sunlu is the value pick and the Prusament is the consistency pick.

Today the Sunlu PETG High Speed Matte Filament GREY 1.75mm 1kg costs $23.70 less at its best price.

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