The mid panel slides in between the Z motor and the Z verticals, resting on the bottom extrusion

As shown in the illustration, pre-install the m3x12 screws. These will be used later to attach the Pocketwatch extruder. It is much easier to place them now into the receiving nuts, than later.

All holes in the panel will have screws when complete.

NOTE: If you use the split mid panel mod, this step can be skipped for now.