Very bad stringing
Hello, so just assembled 2 tool prusa XL. Stringing was initially very bad, however lowering the temp down to 210C helped significantly. It's still stringing though, what settings have people changed to help with this? Attached are before and after pics of the temp changes. I used the prusa XL 0.4mm speed default settings 
RE: Very bad stringing
Check if your filament is too wet, dry if necessary. Get a baseline with a non-IS profile, for me IS is still way worse quality. Temps are generallly too high, definitely print a temp tower. If that doesn't fully eliminate it, print a stringing test and dial up retraction (but beware that necessary changes will be very small - too much and you'll get clogs).
I print most of my PLA (non-IS profile) at 200-205°C, though some work well at 215°C.