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.
I'd say that repair questions are more on-topic than construction. And if construction questions are okay, then repair questions should be too.
An example format might be:
I've tried {a[]} to fix {X}, but {b[]} occurred. What are some other common means of fixing {X}?
Most of what is acceptable on SE is troubleshooting and I feel that repairing is a subset of troubleshooting. In other words, typically you'll result in repairing from troubleshooting, but [hopefully] not the other way around. So, a repair question is essentially requiring, upfront, what a great quality answer would provide in some troubleshooting questions.
For example:
{X} isn't working, what could be the cause?
could lead to:
I've encountered {X} as a result of {Y}. I was able to fix it by performing {C}.
Where {C} is typically going above and beyond the OP's question.
