Welcome back to Aurora Tech Channel. I have 2 Creality CR-10S Pro V2 printers, and they work great. But there are several reasons why I have never done any upgrades on both of them. First, they printed quite well out of the box. Second, this printer has a ribbon cable, so all the stepper motors, the hotend, fans, and thermistor cables are integrated into one single ribbon cable. The advantage is that the cable management is much cleaner, but this makes it much harder to upgrade as we cannot see which wire is which. I always wanted to make this printer have a direct drive extruder and add another fan to improve the part cooling since I installed the My3D OMG DM1 extruder on an Ender 3 and it worked extremely well, so I will get another OMG A2 extruder and install it on this CR-10S Pro V2. It came with the same extruder as the DM1 plus a hotend. I will install it on one of my CR-10S Pro V2 printers and compare it with the other one with a stock setup to see if the filament retraction and cooling have improved after this upgrade. Let’s get started. Affiliate Links: Installed on CR-10S Pro V2 in this video: Amazon Link: My3D OMG A2 Set (OMG Extruder + Mount + Hotend + Air pump tube) https://amzn.to/3kEXPSF OMG DM1 Extruder (installed on Ender-3 Pro in previous video) https://www.youtube.com/watch?v=wx0FEp3uB2I Amazon Link: My3D OMG DM1 Set (OMG Extruder + Aspina Light weight stepper motor) https://amzn.to/3ot7xJ0 My3D OMG extruder official website: https://www.omgextrd.com/ Creality Refurbished Printers (SAVE UP TO 50%): https://bit.ly/3q17mGi Used Ender-3 ($79): Maybe in bad condition, but if you know how to fix some common issues of a 3D printer and have spare parts to replace by yourself, that could be an amazing deal: https://bit.ly/3LPnzHw 3D Models from Thingiverse: Calibration vase - Stringing, overhang and bridging test https://www.thingiverse.com/thing:53347 Overhang test, four directions, 10° - 70° https://www.thingiverse.com/thing:4944519 Follow us on Twitter: https://twitter.com/aurora_lung