I consumed whole spool and faced problem with nozzle jam, it creates bulb like formation in nozzle and jam it. so almost for every print I had to pull it back and remove the clog that was visible for in print. After a lot of adjusments in printer i still faced it, So i read about spool thickness and measured it. And yes it varied. A humble request to seller is to provide good quality. Due to this problem this time I am trying with some other company.