A. The print drum is worn and loose, causing the printing to be light in places.
B. The ribbon is low on ink or missing and must be replaced to get proper output.
C. The heating element has failed, and a new one needs to be installed for proper transfer.
D. The wrong type of filament is loaded, preventing it from sticking correctly.
E. The fuser assembly is not calibrated properly, causing it to impact the paper too hard.