Last night there was an error in printing that caused the printer to stop printing, but kept the hotend on. This morning I discovered that it had fused to what it was printing after remaining on all night - it took some time to remove.
Prints afterwards showed signs of under extrusion. Now when I tell it to extrude a millimeter, it no longer extrudes a thin strand, but instead exactly a millimeter of filament comes out the same diameter as it went in. Cleaning the hotend has done nothing, cleaning the extruder has done nothing.
I'm left with two conclusions, either:
- this is what is supposed to happen, it was broken the whole time, I had calibrated it for the broken setting and just need to recalibrate everything, or;
- something, most likely the nozzle, is broken.