Setup for squaring twin X-axis gantry

[Neale]

If you are fitting home switches, then in general terms what's the best kind? I'm looking for repeatability here, I think, and the choice seems to be some kind of mechanical switch or a proximity switch. I'm happy that I could interface either kind with whatever electronics/breakout board I eventually select. I have some slight concerns because my 3D printer uses simple little microswitches. In principle these should work OK but I've had repeatability problems with the Z axis switch as you are looking for better than 0.05mm or so and the original switch was not capable of achieving that. In the end I swapped switches around until I found one that gave better repeatability but as a result, I'd like to make sure that the new router, when it gets built, doesn't suffer this way. Could be a critical issue if you are using dual X motors when it comes to squaring/resetting, of course.

[JAZZCNC]

If you are fitting home switches, then in general terms what's the best kind? I'm looking for repeatability here, I think, and the choice seems to be some kind of mechanical switch or a proximity switch.

Question is how deep are your pockets.? High repeatabilty requires high quality switches and they cost plenty. I find for general DIY then your average chinese Proximity switch are good enough with much better repeatabilty than cheap MS and even better quality MS like Honeywell's.

Mechanical MS are ok for limits, thou I tend to use proximity for both has they are cheap enough and I just use the same 24V supply.