When the 3D printer gives up, don’t wait for the experts. Here are solutions to the most common problems: layers failing to attach, stringing, and overheating. Sometimes there isn’t the time or money ...

But it also looks like pillowing as well? I could clean my extruder but a set of new 1st party brass extruders is cheap enough that it's not worth the effort. No that is massive under-extrusion not ...