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Advantages: 1. Double gear extrusion mechanism, high extrusion force, ensure smooth feeding 2. The original aluminium alloy driver for CR-10S PRO ,can also be installed in Ender-3, Ender 3pro,Ender 5 ,Tornado... stable and durable. 3. All-metal aluminium alloy, DIY aluminium block, self-assembly 4. high quality 5. Better pressure pushes the filament into the printer nozzle