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3

No, but the answer could depends on how you set up the lead screws, what kind of lead screws are used and how they connect to the stepper. Also it is important how you transfer the linear Z motion into the X gantry. Note that regularly used TR08 (Trapezoid, 8 mm) lead screws are stiff enough to not flex under the limited load of an X gantry. So, putting them ...


2

The motor is mounted in a fixed position no matter if it's on top or bottom. You can imagine the lead screw as a rod hanging down and supporting the bed in the Z direction only, because all of the XY rigidity comes from the Liner rails the bed is attached to it works just as well if the stiff rod is under compression instead of hanging from the rod. Any ...


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