See here for some optional upgrades possible with the Ender 3. Ender 3 Pro and Duet Maestro Guide Part 5: Upgrades
These include a Z axis lead screw change, BLTouch Z probe, moving the Z axis endstop to the top for a Z max endstop used for power loss recovery, replacing the loud fans with quiet Noctuas, and adding an LED strip for better visibility.
Some of these upgrades will be shown in this guide like the fans, LEDs, BLtouch, and PanelDue, but others like buck converter, lead screw change, will not. So please do check out that guide if you're interested.
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