Proximity switches or limit switches

[JAZZCNC]

The plastic mounts for the limit switches I printed will actually slide down the rails and the extrusion if the gantry goes up against them (provided i use plastic slot nuts that I've designed and printed that will secure the mounts in place up until a certain amount of force). I could modify the print so that the rail carriages come into contact with the mounts after the limit switch is activated so it would slide the mounts and activated limit switch out of the way without damaging them. Behind this I could put a buffer as you suggested. I think this would work and if things did go tits up I'd notice it happening if I was looking. The mounts are cheap to reprint if they do get damaged. Next question is... is it worth using one off those PILZ relays to cut PSU/mains voltage off and does this stop movement quicker?
Thanks for all the advice.

Then you have all the hassle of setting back up again and I don't think you realize just how many times or how easy it is to smack a limit when new to CNC and setting a machine up for the first time. To be honest I don't see the problem with making them slide past and do away with the hassle.? They also work better IMO but that's open to debate which I'm not getting into.

Regards the Pilz then you don't need it at a hobby level and while it might detect a mili sec or two quicker that won't change anything because it's inertia you are dealing with and couple of mili secs of movement is nothing.