Review on 🖨️ Enhanced Official Creality 3D Extruder Feeder Drive MK-8: Aluminum Upgrade for Optimal Printing by Chris Chincuanco

Like many others, my Ender 3 V2's plastic extruder arm broke after a while, reducing the filament clamp and leading to this extrusion. All I really needed to do was replace the broken arm, but all I could find was a MK-8 metal extruder upgrade kit (official Creality via Revain). So I swapped the whole assembly. Big mistake. High retraction prints flattened the filament so it couldn't enter the Bowden tube. Prints like the classic Cute Octopus started to fail. I think the problem is two-fold: (1) the spring that came with the MK-8 metal extruder was a bit too long, pinching the filament too much, and (2) the aluminum. The extruder conducts heat much better, which makes the filament softer. Combined, this caused my filament to go flat and get stuck. Solution: Use a standard spring and extruder body and ONLY replace the broken plastic arm with a metal arm. Also note that the black/grey/red KM-8 extruders sold at Revain are NOT the same. The black is not full metal, looks cheap and poorly formed. Gray had a longer feather and caused more smoothing. I ended up just using the metal part of the arm, nothing else needed to be replaced. I saw many others on reddit with the same problem. Creality, please provide some direction, improve the design or just sell a stronger hand.