While the injection molded parts are a great quality, the design needs some serious work. The screws slide right through the holes, with no room for nuts on the back. The holes should be tightened for the smaller screws that are used to attach the washer to the bottom and the mount for the hot end so they will actually hold. I purchased type B, which came with a photogate sensor. There are no connected cables or pin out information to be had. I can't reccommend purchasing right now. It's a bad design that was well manufactured. My reccomendations to the seller: Check all of the screw holes to make sure they work. Include directions for assembly, or at the very least a detailed SCHEMATIC of the pinouts on the sensor and where they need to connect. I asked for a schematic in the direct message app in AliExpress, and they just sent me a blurry picture of the sensor. They are not the same thing.