Auto_Bed_Leveling: Z-Probe Repeatability code

[Roxy]

Just did it a sec ago,

Seems to work quiet well, I use a tower pro SG90 btw,

>>>M48 n 15 x 50 y 50 e
SENDING:M48 n 15 x 50 y 50 e
M48 Z-Probe Repeatability test. Version 1.50
Mean: 2.885400
Standard Deviation: 0.008681
echo:endstops hit: Z:2.88

You did specify the 'e' option so the Z-Probe should have been engaging and disengaging. But OK, ignoring that, your Standard Deviation of .0086 is better than what I'm getting when the probe is staying engaged. Are you printing with a layer height of .30 mm ? I'm guessing you are getting good results with your Auto_Bed_Leveling, right?

I've noticed something else I don't understand. The standard deviation varies depending upon the bed temperature. I'm getting better results with the bed hot. It doesn't seem like that should matter.

When doing a M48 for the first time it did the probing at x100 y100. The play was then (Standard Deviation: 0.018029)

If you don't specify where to do the probe, it should do it where ever the nozzle is currently located. Was the nozzle at (x,y) = (100,100) ?

The e command should make it retract and extend right? Well that doesnt seem to do anything here tho.

Can you try sending it an M401 and an M402 command? Does that engage and retract the Z-Probe? This new M48 command uses the same support functions as the M401 and M402 command use. Specifically: engage_z_probe() & retract_z_probe()