The print roller is a sensitive component. Be extremely careful during reassembly to not bend or warp the metal.

During reassembly, note the following to properly reinsert the print roller into its plastic housing:

Two metal L-shaped rails at the bottom of the print roller need to slide under cutouts in the plastic housing.

Two metal hooks at the top of the print roller need to fit under the top corners of the plastic housing.

Insert the print roller at a downward angle to fit the hooks in first before sliding the rails into place.

Push the print roller into its plastic housing until you hear the plastic tabs click back into place.