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Before continuing with the assembly, the gantry must be squared and all screws full tightened

Ensure the three extrusions are pressed together with no gaps. If clamps are available, the extrusions can be optionally clamped together for the remainder of this step. If using clamps, make sure they are positioned as low as possible. Do not deform the "C" shape of the extrusions!

Tighten the four marked M8x16 screws in the extruded brackets to secure them to the rear 40120 extrusion. Check that the measurements mentioned in Step 3 are maintained

Verify there are no gaps between the extrusions, and that the extrusion ends are aligned

Fully tighten the remaining four M8x16 screws in the extruded brackets

Using an engineers square, or a flat edge, check that the side plates are flush with the extrusions at the top of the gantry

Fully tighten all fourteen M12x45 screws on both ends of the gantry to secure everything together

Verify that all parts of the X-axis gantry assembly are still correctly aligned and adjust as necessary

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