DHP linear servo Z-Probe

This is a Z-Probe that I designed for my 3KU printer, but can be used for a wide range of printers, simply by adjusting the lower guide.

You will need:
the STL files printed; note the body is actually TWO parts with a skirt that you cut off after printing; this minimises warping during printing
1 x 2mm aluminium knitting needle (cut to length)
2 x M3x30mm screws with nuts to mount the optical end-stop and hold the halves together.
2 x M20 (Optional) to hold the upper part of the halves together
1 x M2x8mm self tapping screw two close the lower arm firmly around the needle
1 x optical endstop
4 x M1x5 self tapping screws to mount the linear micro servo
1 x micro linear servo (left) - these come as "left" and "right" units; get the LEFT one, here is and example: https://www.aliexpress.com/item/3-7-5V-RC-Servo-Plastic-Nylon-Gear-Digital-Linear-Servo-For-RC-Ultra-micro-Aircraft/32972306205.html?spm=a2g0s.13010208.99999999.260.2f5f3c00yk4zp5
NOTE: I have picked a seller at rando