Have you tired to contact the manufacturer? I've seen the same sensor on AliExpress for only a couple of dollars if that's what you mean. Maybe we should compile a list of the differences between the DP4/5 as the 5 is 24volts so you'd need a sensor that can handle this power and not the more common 12 volt. If you wanted to go back to the microswitch you have the file on the memory stick that came with the machine for the bracket.
Those proximity sensors are available, from AliExpress and are 5v - 36v the part is SN04-N, Marlin sees it as an endswitch, so it should be a matter of plug in and go, just need to set up the proximity to the bed, depending on what product you use to print. Great idea of listing the differences between the DP4/5.
Hello, I thought that the DP5 part cooling fan might mount on the DP4 X-axis carriage but they are slightly different, it might pay to ask Lucy if the DP5 carriage and part would fit the DP4, that seems the easiest solution, and if it does, try to buy the complete assembly from her. That would be, carriage, part cooling fan, 30mm fan, and sensor. worth a try.
Hello. I finaly did it. The sensor was pretty easy to wire (had to put some resistors between sensor output wires to get 5v/0v for on/off), easy to configure Marlin. Now I have autolevelling function 😀.