The top of the Z towers will fasten to horizontal extrusions on the left and right sides of the frame.
Attach corner cubes to opposing ends of the extrusion with (1) M3 nuts inside the extrusion channel and (1) M3 x 6 socket head screw for each corner cube. (Optional) Use an M3 washer on each M3 x 6 fastener to prevent the fastener from bottoming out on the extrusion when torqued.
A small hole should face up and towards the outside of the extrusion. Use the image as a reference.
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