I was disappointed in YOYI's web store as a fan of 3D printing. Despite their claims to be the ultimate source for 3D printing filament, they had a small variety and poor quality filament. Because of the poor-quality filament, I had numerous unsuccessful printouts, which was frustrating and time-consuming. My request for assistance was met with unhelpful customer care. Additionally, prices were higher than at other internet retailers. Anyone who is serious about their 3D printing endeavors should avoid using YOYI, in my opinion.