Been trying to work out why my machine was having some issues with extruding single lines - I thought it was the extruder so stripped the machined and cleaned everything, etc, still had the issue with single extrusions being underextruded and not meeting the perimeters - couldn't work it out out, but I just loaded a new model and when previewing, I can see clearly on this one the problem, the extrusions are doing some weird stuff, any idea what's causing this?