Extruder and Stepper Motor go together
Preferably, you should always use the extruder attached to the stepper motor when you mount it on a printer.
If you need to put a plate in between the stepper motor and the extruder please notice that you need longer screws, and the max supported thickness is 3mm.
This image below shows what screws are used on the LGX, and the red ones are used to attach the stepper motor and extruder:
To use a plate in between the stepper motor and the extruder, you need to replace the stock M3x27 low head screws with the 3 M3x30 low head screws we send in the accessories bag, which are compatible with printer plates of thicknesses between 2 and 3mm.
Don’t use a plate in between without using the longer screws.