Ender 3 - Direct Drive - Axis endstop as Runout Sensor
thingiverse
This remix of the direct dirve adds the functionality of a runout sensor. I already am using a CRtouch, so have no more use of the Z axis endstop, it is repurposed as the runout sensor. The endstop is screwed on the direct drive brakcet on the top. You need to download and print the two files including plus the endstop cover from: https://www.thingiverse.com/thing:3394736. The Z axis endstop is the same as the X and Y axis ones, you can use any of them. You will need 4 M3 screws.
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