... ) diameter of 3.0/1.75mm, variations + /-0.1mm,roundness +/-0.05mm;(6) 1 kg /plastic spool packaging, can be automatic feed;(7) ... smoke ,tastelesswhite smoke, concentrated flavor ,make headacheRoundness+/-0.05mm+/-0.03~0.08mmwater absorptionVery low, no bubbles occur when printing ... have diameter laser detect kits to control extruding rate on line, when diameter smaller or higher than accept range, ...