Clived72

Help! After struggling to get a large print started (Ultimaker 2+) I finally got it adhered well and printing nicely. It's been running smoothly for about 26hrs now but has just started to act up. I think it's on layer 266 out of 272, so just about to start the top layers (5 according to my default cura settings) but now the head has just started travelling forward and back between two points with the odd detour thrown in. It's clearly not supposed to be doing this and it's not laying down any filament. I've tried pausing and restarting but that same happens again, and I've tried removing and reloading the filament incase it was jammed. It wasn't, it came out nicely when loading but then continued with the weird travel. I'm loathe to abort the print at this late stage so does anyone have any suggestions? Is there any way I can reslice just the top 5 rows and have the printer print them on top of my current print? Thanks