What failures should I expect?

[Lexi]

Poorly cleaned bed plates will be most of your issues.
The rest are likely to be filament dependent.

One other thing to watch out for is extruder changes…

The nozzle temperature is abnormal,the sensor may be open circuit

You turned the printer off when plugging/unplugging this connector? When changing out hotends I have had instances where the connector wasn’t seated firmly. It’s usually pretty obvious when you turn the printer back on as the display shows a hotend temp of “0” instead of the ambient ~28 degrees it usually is. I will then turn the printer off and reseat it. It also helps to actually push the 4 wires under the wire clip on the extruder housing before you plug it in. I have noticed that if I leav…

Part Cooling Fan Won't work

Are you sure it is lined up correctly? In that fist picture it looks like it is not lined up. I have plugged those connectors in before and had them totally misaligned where it felt like it was plugged in but was off by a whole row of pins. This is how the connectors should look with all 3 plugged in: [disconnect_fan_cable]