The author remixed this model.
This remix add the ability to adjust the servo position vertically, removing the need of printing custom docks to make it sit at the proper height.
BOM
simply add the heatset inserts to the mount, and connect it to the slider using the two m3 bolts
Update:
added a version with a built-in snap mechanism to keep the mount aligned with the y extrusion (avoids it pivoting on screw). Supports are built-in and come off easily