https://alexnld.com/product/bigtreetech-aluminum-alloy-bowden-extruder-with-capricorn-ptfe-tube-kit-for-1-75mm-filament-ender-3-pro-cr10-3d-printer/?hilite="SIMAX3D 1M XS Bowden Tube Nut Ender 3 Extruder Hot Bed Die Spring for Ender 3/3 Pro 3D Printer"