I have made by first big print on my MK3 it was the "Fillenium Malcon Easy Print Remix"
So the print went ok, but I had internal stringing in one part of the print with lots of filament pieces that we in the inside of the print. The print was made with no-fill which is suggested on thingverse so not problem their.
Funny if this had happen on my first printer (Mk3 is my second) I think the print would have crashed. Take a look have you seen this before?
I am using the new sclicer 1.4.1 and it did seem to print the layer with lots of moving around from side-to-side and left to right.