This was a simple part I did up during the process of repairing a Kobra that I ended up with, after updating the cooling I found that I didn't have a Proximity sensor anymore. In my case I ordered a LJ12A3-4-Z/AX from Ali and installed it. After verifying it worked with a Zip tie this was the result.

2x M3 x 8mm to mount into original plate. Adjustable up and down simply using nuts to hold into correct height. Printable upright or lying down, in my case I had the block down and just cleaned up the little stringing from the overhang. No support required that way.
I have done this in PLA+ but recommend PETG if PLA starts to deform although it shouldn't thanks to fan proximity. End of arm sits tight against Blower upgrade you can see.

Anycubic

i3 Mega S/Pro

Doesn't Matter

Doesn't Matter

0.2

20%

I printed this lying down without supports. Due to not bothering to tune this printer well there is some drooping. It took a second to clean up and the part worked fine. If you wan this can also print standing up but does require supports in that orientation for the screw holes.