'Solid White' is truly the most opaque PETG I've found to date, and it is a nice bright white, leaning toward the cool side. I tried to get some pics of it in action but I don't think I did it justice in my lighting. It's very close to Hatchbox PLA in opaqueness and warmth of color (Hatchbox being my go-to premium PLA for color-exact projects). Every other PETG white I found leaks light or is a warmer white which looks gross. This stuff is TOUGH, too; I've printed with Overture PETG and that's very brittle in comparison; this is more like SUNLU or Elegoo and can handle a lot of repeated snaps on parts which connect to it. On my Bambu Labs A1 I run a G10 Hobby plate from Darkmoon3D (Garolite) to get a matching glossy plate-side finish. My plate likes 80C with this filament, and I print with the fan off for 3 layers and then max 30% after, with the standard stainless steel 0.4mm nozzle set to 240C throughout the print. Speeds at 0.20mm layer thickness are initially 45mm/sec (60 for infill) which gives me an almost 100% flat layer across almost the entire bed, and then I bump it up to 70 for outer walls, 95 for inners, and infills running at 110. Top surface I slow down to 65; overhangs are 0, 40, 30, and 15. I also slow the printer's movements down a bit to Travel: 500, and accelerations at 2000, 500, 1000, 0, 2000 and 100% (in Bambu Studio); otherwise I see the bed shaking too much on taller prints. This works for prints up to about 4" tall; beyond that I take the speeds down further, but most of my prints tend to be under 2" tall and take up the bed.