https://alexnld.com/product/full-metal-silver-titan-extruder-idling-arm-with-spring-prusa-i3-mk2-1-75mm-for-3d-printer/?hilite="Trianglelab / Dforce hotend PTFE Tube Teflonto for prusa i3 anet mk8 1.75mm filament ID1.9mmOD4mm Capricornus tube for 3D Printer"