Cheap And Discounts Ender-3/CR-10/CR-10S Full Metal J-head kit Aluminum Heat Block For 3D Printer 12V/24V Bowden Extruder All Metal Hotend 0.4MM Wholesale. Buy Directly From Merchant GEEK 3D Official Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.