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:
Don’t use a plate in between without using the longer screws.
4 ADDITIONAL MOUNTING POINTS
Use the supplied studs to replace the 4 screws of the stepper motor and use them as additional mounting points.
You can find these studs on the accessories bag in your LGX™ package.
They have a M3 thread with 4 mm depth.