Best suited tube for filament-supply.  When compared to the conventional fluoroesin tube, Sube-up tube is very flexible so that the tube can follow the high-speed of the machine operation without kink folding.  In addtion, its inner surface is as smooth as the fluorine resin; therefore even the sticky, soft filament can go through without getting jammed.  FDM 3D printers require stable supply of filamenets as it affects the quality of products, and Sube-up tube may meet that needs.