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Bump stop along with G28 & G30 have been a life saver for me. Right now I use an “L” shaped bump stop, but I think I will change it to pins as Peter shows in this video.
I highly recommend a Z-probe, whether you buy one or make one (it is a relatively simple device). I bought one with my machine because it was easier to order everything. It is a simple 2-wire connection with a piece of conductive material.