well the thing about pid tuning is that it doesn't work that well.

I made the mistake of trying different firmwares recenty.
And once going back to the original - my temperatures are all over the place.

But because they change so quickly - the heatblock and nozzle seesm to maintain a stable temps.
5c + and - minus is oretty good.

Also you need to run the pid process several times.

Apparently it improves slightly each time you run it.

It's a bloody awful system and I don't really understand why it's so unreliable.

But try running it a few more times - set it aftyer each time. And then do it again.
The temperature swing should improve each time.

My sapphire pro 2 is the only printer I've ever needed to do pid tuning on.
All the others have just worked and never needed any tuning.

At the moment I'm reading up on what the different values mean - I figure that way I can work out better how to change them and fine tune the system manually.

Oh yeah don't forget to run the part cooling fan at 100% during the pid tuning.
Apparently it improves things.