SUNLU Easy PA Nylon Filament - Warp-Free & Easy Printing with Nylon 6+66, Strong, Durable Engineering Filament on a PC Spool, 2.7kg Spool(5.95 lbs), Black

Well-known as much for their S1/S2 filament dryers as for the filament itself. The material catalog — PLA, PETG, ABS, TPU, silk — is broad and frequently discounted on Amazon. Solid all-around option.