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I just want to say thanks, because of your design, I was able to make myself a probe with stuff I already had!!

I tore down an old HP printer a while ago, and it had a couple of the optical stops like this, but they were wider. I desoldered one from it's support board which was no good anyhow, and modified it to fit this shell. I was able to doctor things so I could connect it to the Z probe connector on my Ender 3 Pro.

I think its important to point out that if anyone uses the sensor that does NOT have the little PCB on it, it's a whole lot more complicated! You need a current limiting resistor on the LED emitter. It is more complex to connect the sensor side also, although it gives back in flexibility. You can customize it to either pull a voltage up to 5 or down to 0 for the pin, or to act much like an actual endstop switch like I did on my Ender 3.

I didn't find a 40mm screw to use for the pin, so I just printed a pin myself, and epoxied it into the flag! Hoping heat doesn't hurt things. I also epoxied the servo onto the frame, as screws were too hard to find for it in my case. I'm not even using the top cover at this point, as my sensor circuit sticks out a bit more than the one indicated here. I might just modify the cover to fit.

I am using Klipper also. Took a while to get everything working together, but I also am getting the accuracy that everyone else is getting! .0027 Std Dev! I think it would be a good idea to add a note to your klipper instructions indicating that there is a real need to familiarize oneself with the probe support documents before your instructions make sense. The document is at https://github.com/KevinOConnor/klipper/blob/master/config/example-extras.cfg.

I used an old USB cable also, and in my case I was able to use the shield as a ground conductor, since I needed 5 conductors total. (5V, GND, STEP, and 2 for the connection from the sensor to the Z-Stop switch connector.

Thanks for the clever plans!