California Filament Gray PETG vs Sunlu High Speed Matte PETG Filament

Both are 1.75mm gray PETG on 1kg spools, but they target different printers. The Sunlu High-Speed Matte is the pick for fast, modern machines: it is rated to 600 mm/s, has a matte finish that hides layer lines, and tighter ±0.02mm diameter tolerance. The California Filament Gray is a standard-speed PETG with a glossier look, a refill option that fits Bambu spools, and a strong 4.9 rating, though from only 29 ratings. Choose Sunlu for speed and finish; choose California Filament for refill economy and a plain, predictable PETG.

• Choose the California Filament Gray if you print at normal speeds, want a refill that drops into Bambu spools, and prefer a standard PETG you don't have to dry aggressively.
• Choose the Sunlu High-Speed Matte if you run a fast printer, want a matte surface that hides layer lines, and will keep the spool dry to control stringing.