Got lazy but have posted once about my Extruder being the reason why Octoprint or Firmware is not starting the Print.
I compiled my Marlin Firmware by adding
#define DEFAULT_Kp 16.44
#define DEFAULT_Ki 1.58
#define DEFAULT_Kd 42.75
and it starts, but it does weirdly extrude. When I hit "Extrude 5mm" Manually while nothing is running then it seems like a nice constant flow, but when Printing it somehow stocks, retracts or smth when trying to print. At first I thought its TPU and a new abstract material I have never touched but this currently is the good old Black PLA from Creality that I always used.
I use Cura and just used the default settings for PLA like always.
How do I save it into the eeprom? I could download the official Ender 3 Pro Marlin Firmware and do it I assume
If the only thing you wanted to do is change the PID values then you should go back to your previous firmware. For PID tuning I can recommend this site: https://teachingtechyt.github.io/calibration.html#pid
I heard that compiling your own Marlin Firmware would be better because you get the new features and etc. The Marin firmware gives me my Ender 3 Pro as a config I can compile which I used. So I assume I get nothing in return for using the Official one or my own compiled one.
I learned now that I could save things to eeprom with "M500" command and found on Reddit a post that gave me "M92 E420.69" for my Creality Pro Extruder. A funny number indeed
You can compile a new Marlin for new features but you should know what you are doing and which features you need/want. I have compiled the newes version for myself but I did that because I needed some custom options because I modified the printer.