https://alexnld.com/product/3pcs-blue-1m-long-distance-ptfe-feed-tube-for-1-75mm-filament-3d-printer/?hilite="Trianglelab / Dforce hotend PTFE Tube Teflonto for prusa i3 anet mk8 1.75mm filament ID1.9mmOD4mm Capricornus tube for 3D Printer"