It is possible to gouge the bed when playing with the Z height
One thing I am surpirised of, is the lack of talk of gouges in the bed, from incorrectly set Z axis.
On my Printrbot I set the Z using M212, and its so easy to type the wrong value and have the nozzle hit/scrape the bed.
But it doesn't seem such a big issue on the Prusa, and considering you can control the Z axis via live adjust, I would think this quite common.. Does the MK3 protect itself from such a thing?
Re: It is possible to gouge the bed when playing with the Z height
assuming you make it through the calibration process correctly then its less likely. My Live Z is about -.4. If during the first layer cal I immediately cranked it down to -1 or more without even looking then yeah, it will crash. You calibrate with PLA because thats about the lowest you'll ever need to go. Even adjusting for something like PETG you won't need to raise more than about .1
Your first layer is going to start looking like crap well before it does any damage.