Since I modeled an entire copy of the Panasonic hinge cap in CAD, I decided to take the time and improve on the design with my own iteration.

The new design improves upon the Panasonic design in three ways.

The 2 degree body draft angle was removed, allowing for a more square profile and thicker walls. This reduces the chance of vertical shear lines forming into cracks.

The stepped geometry inside the OEM cap designated for hinge clearance was removed since the draft angle no longer brought the cap wall in contact with the hinge.

The screw hole fill was increased and the previously ribbed geometry around the hole was completely filled. This reduces the chance of hole tear-out when the cap is removed several times.