I'm having a slightly strange problem.
Last weekend I fixed the heat bed on my I3 (i'd originally got the heat bed element upside down). I then levelled the bed, and printed a few small parts fine.
However when I printed something larger i've noticed something very odd - towards the back of the bed as it moves up (z) in layers, the print drifts to the left, however at the front of the bed the print stays aligned.
All I can think of is that the cable routing to the heat bed has changed, and is causing the problem, but I would have expected the drift to have been less even, overall it appears as if there is a twist in the print.
I would appreciate any suggestions to try ?
Peter