Originally Posted by
Roxy
On the Z-Probe... You can measure the Z-Offset, but it is only a guess. You have to manually fine tune that number because every micro-switch is going to fire at a slightly different place. If it is close, it isn't too hard to watch the first layer to see if the nozzle needs to be slightly closer or further away. I move the Z_PROBE_OFFSET_FROM_EXTRUDER by .1mm at a time until I get it right for however things are screwed together on my extruder. (Every time I take it apart to clear a clogged up nozzle, the value changes... And I have to move it up or down a little to get the number right.) But once it is dialed in... Every print has the first layer go down nice and clean.
On the +.14mm per turn comment... Do you know how many threads you have per inch or per mm on your bed mounting? If so, you can just calculate the number and change the +.14 turns number to what ever you have. But if you have your bed mounted on springs in the corner, you could just take a micrometer and measure the thread spacing. That is where that number comes from. But as it turns out, that number can't be used directly. Here is why: If one corner is up 1mm from the mean, you probably only want to lower it .5 mm because the mean is going to move downward as you adjust things. (I realize it seems like you should be able to move it the full amount downward, but my experience is it is better to move it halfway of what is suggested and remeasure.) It is kind of an iterative process. With 3 or 4 adjustments you should be getting really close.