BIQU Optical Endstop with 1M Photoelectric Light Control Optical Limit Switch for 3D Printer (Pack of 5pcs)

The quality is fine, and value excellent **BUT** the wiring harness supplied is incorrect - hence they did not work and were 'always on' when connected to a RAMPS 1.4 board.NOTE the writing on the PCB which is correct - you will need to swap the outer two pins in the sensor end of the wiring - Red is VCC white is signal(the pins can be removed from the connector by pressing down on the tiny tooth on each individual connection whilst pulling the individual wires)swap red and white no soldering required - and you should be in businessThe connectors are keyed - so you cant just flip themWhen they work - the green led lights when the beam it broken (not all the time)Luckily the incorrect wiring didn't blow anything up - and my ramps and sensors all survived

This is a perfectly well built board but with one big caveat.There appear to be no standard pin configurations in the 3D printing world.To use these boards with SKR V1.3 I found I had to swap the wires at one end i.e. the wires that go to pin 1 and pin 3 need to be swapped over in order to correctly connect signal, ground and VSS.You have been warned!With care, you can remove the crimped connectors from the plug and swap them round, no soldering or re-crimping required.So, good product but don't assume it'll work without a little TLC.

The endstops work well but you need to check the supplied cables to save a lot of headaches. As has been said before you may need to swap the signal and vcc wires around depending on the motherboard you are connecting to. The labeling on the pcb is correct so if you are making your own connectors just use that as a guide (the socket is a JST 2.54mm pitch). If you are planning on using the supplied connectors to connect to a motherboard (in my case a MKS Base V1.5) you will either have to swap the red and white wires at one end of the cable or desolder and resolder the connector the other way around. I've tested them using the 5V supplied by the motherboard but according to other internet sources they will also work at 3.3V

Works great but plug is on the wrong side if you’re looking for a RepRap one.

used these on a Chinese CNC Machine, used on the XYZ Axis to prevent any over travel on the axis.

As stated before the labeling on the pcboard is incorrect also the connectors on the ramps end are also incorrect they are jst xh which are keyed and the wrong pitch I fitted 0.1 pitch crimp housings from hobbytronics which are not keyed so you can just flip it around so the white is vcc and the red is signal in all cases the ground is in the middle thanks to the other reviews I did not return yet again poor or non existent documentation

I read other reviews so was prepared for the wiring issues. However, only three out of five actually worked. There seems to be no way to return a part of an order so I guess I shall have to send the lot back? Not impressed overall but the three I have left do at least work. So, buyer beware as usual I guess.

These do not work. They are constantly triggered, and the wiring is wrong. Even when rewired before first use, they still do not work.