# UNDERGROUND FILAMENT > Underground Filament produces American-made 3D printing filament engineered for real-world use. Our materials deliver consistent diameter, true 1 kg net filament per spool, and reliable performance for functional parts and production printing. We specialize in bulk PLA and PCTG Pro in translucent and solid colors, designed for makers, professionals, and print farms who demand strength, repeatability, and value. ## Pages - [Home](https://undergroundfilament.com/) - [UNDERGROUND FILAMENT](https://undergroundfilament.com/shop) - [PCTG Print Settings](https://undergroundfilament.com/pctg-print-settings) - [Return and Refund Policy](https://undergroundfilament.com/return-and-refund-policy) - [Terms of Service](https://undergroundfilament.com/terms-of-service) ## Contact ### Hours - Monday: Closed - Tuesday: 12:00 - 19:00 - Wednesday: 12:00 - 19:00 - Thursday: 12:00 - 19:00 - Friday: 12:00 - 19:00 - Saturday: 12:00 - 19:00 - Sunday: 12:00 - 17:00 ## Social Media - [Facebook](https://www.facebook.com/546102019124651)