Prusa Research Prusament PLA Lipstick Red 1kg
Prusament PLA is Prusa's own in-house made filament. The whole manufacturing process is closely monitored and tested - they guarantee ±0.02mm precision and highly-consistent colors. You can inspect parameters of every spool they made at prusament.com. Check the sample spool!
When you want to be different. If everyone is printing black, why not printing red? ;-)