Edit: Worked out whats happening, see post...
About my bed levelling.
Yesterday I manually levelled the bed, didn't need much adjustment, I did the 4 corners as in not to scale pic below
(Attachment Link)
I then did the meshlevelling and ended up with the following.
(Attachment Link)
I retried the mesh levelling a few times during the day and came up with the same (well one or two might have changed by 0.05).
So I was pretty confused when today I thought I would meshlevel again and it came up with the following.
(Attachment Link)
My initial thought was the bed must have moved a lot somehow, so I redid the 4 corner manual levelling , but it was fine. I tried the meshlevelling again, it still came up the same.
Why it went from say -0.100 yesterday to + 0.300 today, I simply do not know. But no matter how many times I do it today (with BED Z on 0.00 as it was yesterday) it comes out identical, yet I must have done it 5 times yesterday and they too were all identical, only completely different. Weird.
I've worked out what I'm doing wrong, doh
What I've been doing is going into the touch screen, using the bed levelling to set the 4 corners manually, then going into Marlin and doing the mesh levelling. Regardless of what I said in my previous post, at some point I must have redone this and moved the wheels.
So today, after yesterdays odd mesh results (all the mesh points being positive instead of the negative values I had the previous day), I checked the 4 corners in Touch screen, way out, two of them took nearly a whole wheel turn. At this point I realised I must be doing something stupid as there's no way they would vibrate that much (upgraded springs).
I went back into Marlin, then it occurred to me what I had stupidly been doing wrong.
I had been using the 4 corner touch screen manual bed levelling with meshlevelling turned on. I turned bedlevelling off in Marlin (remembered to store it), went back into the touch screen, and sure enough the 4 corner test was way out and I had to turn the wheels in the opposite direction to level it.
I then went back into Marlin, did the meshleveling, and sure enough they were almost identical (most were identical, a few 0.05 out) to the ones I did Friday, all negative readings.
So whenever I level my bed, I need to do the following.
Set BED Z to 0.00 and store.
Turn bed levelling off and store.
Go into TFT and run 4 corner manual bed level.
Go into Marlin, run meshlevel and store.
Re enter BED Z value and store.
Then I should be ready to print, finally got it worked out. If someone could look at my post 922 and say which looks squished right, would be greatly appreciated
Thanks
EDIT: I notice that sometimes going into Motion/Bed Levelling on Marlin I have the "Bed Levelling on" (or off) option, other times it's not there. I've just gone from TFT to Marlin and it's not there at all. That has me worried that it could be turned off.
So under Marlin, I've rerun meshlevelling and on completion it now again shows the "Bed levelling on" option. I store it. Restart into Marlin and now there's no Bed Levelling on/off option. weird.