Ender 3 NG v1.2 two-screw Y endstop (with far microswitch)
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Ender 3 NG v1.2 Y endstop that uses two mounting screws (with far microswitch)
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When homing, the Y gantry hits the Y endstop microswitch. This endstop has a tendency to come loose and twist, especially in a heated chamber. When this happens, the Y will calibrate at a further distance than intended. Probes typically live on the back of the toolhead, and this added distance can make the probe collide with the Z rod mount and break the probe.
This improved design adds another mount screw to the Y endstop mount. This solves the twisting problem, and gives the Y endstop a little more grip on the aluminum extrusion. The photo shows the original model on the left, and the improved model on the right.
This is a similar model to my other two-screw Y endstop mod, except this model has the microswitch mount on the back side of the Y position. This allows more clearance when using tools that require the toolhead to extend past maximum Y depth of the bed.