... ,roundness +/-0.05mm;(6) 1 kg /plastic spool packaging, can be automatic feed;(7) to be applied to a ... opened from seal packaging and exposed to air for a period( like one month or shorter time ... dragging rate , make filament diameter range at 1.6-1.8mm/2.8-3.0mm, roundness +/-0.05mm, each ... outlet, rework&recycle material, or dispose, but for quality assurance purpose.4.packaging We put each filament ...