Add a protective cover (or 3D print file for same) for the Centronics 50 connectors. The Centronics connectors were never designed for use in outdoor environments. As it stands, when not plugged in, these connectors are prone to damage and collecting debris & dirt. A simple, sturdy, slide-on plastic protector would help reduce this issue. The aftermarket sometimes offers thin 'dust covers' but they offer little in the way of protection from mechanical deformation of the thin sheet metal surround. Image shows easily deformed surround of Centronics 50 connector.