This morning I started tuning my profile in Cura. As base I used a normal Ender 3 profile.
After that, I made temp- and retract-towers.
I used PLA from Sunlu. As you can see, about 180°C is the sweet spot, which relatively surely tells, that the thermistor isn´t tuned correctly, but thats not the point in this post :D
In terms of retract, I made many tests. I tested the distance, the speed and so on and so forth.
The sweet spot (at 180°C) is:
Feel free to add your settings to the list!
Cheers & Happy printing