The end switches of my 3D spider printer don't work well. I wonder whether it's on-topic asking how to repair 3D printers. In my case I'd describe what does not work, what the result is and what parts are used.
From a good answer I'd expect a proposal on how to fix it, e.g. a suggestion for an electronic piece to buy (like a photo sensor maybe) and how to apply the wiring etc.
Derived from Printer construction, I'd also say that repairing must be on-topic.