IC3D - For 3D Printers, By 3D Printers (TM) Spend more time printing with high-quality 3D printer filament from IC3D. IC3D extrudes 3D printer filament in-house in Ohio, USA. Strict production standards for cleanliness and tolerance specifications ensure the diameter is within +/- 0.05mm and ovality (roundness) is within 4%. Quality is the top priority as each spool is hand checked, vacuum sealed with desiccant, and packaged. IC3D filament is extensively tested with success on a variety of mainstream desktop 3D printers utilizing various extruder designs and hot-end styles. Every spool of IC3D filament is backed by a 100% SATISFACTION GUARANTEE.