Define the mesh size and spacing

FrankV

I try to understand the mesh size and spacing. I set it to the values for y from 0 to 190. My probe is -28 mm from the nozzle so need to adjust the aeria. As in the picture below you can see the y value of the printer is at 203 and thereby bigger as defined in the aeria of 0-190. What am I doing wrong?

fcwilt

@frankv said in Define the mesh size and spacing:

@fcwilt By checking your settings I think I made a mistake with the placement of my offset for the probe. My probe is behind my hotend. So the offset is not -23 but needs to be +23? Y is moving from home 210 to zero at the front of the printer.

Well if the Y offset is +23 then just use Y5:187.

Frederick

fcwilt

@frankv

Hi,

Need more info:

what are your M208 settings?
what are you probe X and Y offset settings?

Frederick

FrankV

@fcwilt ;
Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X204 Y210 Z238 S0 ; set axis maxima

G31 P500 X0 Y-23 Z1.558 ; set Z probe trigger value, offset and trigger height

fcwilt

@frankv said in Define the mesh size and spacing:

@fcwilt ;
Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X204 Y210 Z238 S0 ; set axis maxima

G31 P500 X0 Y-23 Z1.558 ; set Z probe trigger value, offset and trigger height

OK this should work:

M557 X5:199 Y28:210 P20:20

The X parameter simply sets the X range of the grid 10mm less than the X axis range to keep the probe tip away from the very edges of the bed.

The Y parameter cannot do the same as you have to adjust for the Y offset of the probe. So the probe can reach Y=5 but can only reach to Y=187.

The P parameter determines the number of grid points in X and Y, so P20:20 is 400 points total. You can of course pick any numbers you like. Using P is easier than using S as the firmware does that math to distribute the points evenly over the X and Y ranges.

Frederick

FrankV

@fcwilt By checking your settings I think I made a mistake with the placement of my offset for the probe. My probe is behind my hotend. So the offset is not -23 but needs to be +23? Y is moving from home 210 to zero at the front of the printer.

fcwilt

@frankv said in Define the mesh size and spacing:

@fcwilt By checking your settings I think I made a mistake with the placement of my offset for the probe. My probe is behind my hotend. So the offset is not -23 but needs to be +23? Y is moving from home 210 to zero at the front of the printer.

Well if the Y offset is +23 then just use Y5:187.

Frederick

FrankV

@fcwilt Thanks for your help