Only probe where the part will be printed

OwenD

@ratrig0331
Make sure
M98 P"0:/sys/setDefaultProbePoints.g"
Comes after your G31 in your BlTouch section

RatRig0331

@owend ok I’ll move it and give it a shot

RatRig0331

@owend that did the trick but now i need to turn down the amount of probe points
var MinSpace = 10 ; put default minimum spacing
var MaxSpace = 30 ; put default maximum spacing
var ProbeNumX = 8 ; put default probe points
var ProbeNumY = 8 ; put default probe points.
var ProbeCenterX = 285 ; will be updated to probe centre of print
var ProbeCenterY = 270 ; will be updated to probe centre of print

with my 100x100mm print its trying to do a 13x13 grid what do i tweak to lower that?

RatRig0331

@owend ok after letting it 100% there were more errors

8/14/2022, 10:15:03 PM Error: M557: bad grid definition: Spacing too small
8/14/2022, 10:14:19 PM Error: in GCode file line 773: G1: expected '}'

line 773 is your
G01 X0 Y{move.axes{1}.max} Z0.6 F1500 ; Move to back corner while heating

OwenD

@ratrig0331
Change your minSpace and maxSpace in the macro to reduce number of probe points
Try 50 & 100

The G1 is my bad
I did a search and replace when I was changing the braces, but changed one that should remain a square bracket

Change this line in superslicer
G01 X0 Y{"{move.axes{1}.max}"} Z0.6 F1500 ; Move to back corner while heating
To
G01 X0 Y{"{move.axes[1].max}"} Z0.6 F1500 ; Move to back corner while heating

Or delete the line if you don't want to move there while heating

RatRig0331

@owend

One down one to go I’m still getting the m557 error with the 50/100 spacing will this be normal a normal error from down sizing the bed mesh or is there a fix

Error: M557: bad grid definition: Spacing too small

——-Error: in GCode file line 773: G1: expected '}'———- is now fixed

jay_s_uk

@ratrig0331 the most probe points you can have on a duet 2 are 121 and on a duet 3 are 441

RatRig0331

@jay_s_uk too many points isn’t the issue I think, it must be too few points? With the settings first told to me it wanted to do a 13x12 grid on a 100mmx100mm print 156 points total, than I changed the min max to 50/100 and it only probed the middle and 4 conners and gave the same error

OwenD

@ratrig0331

I believe the problem you are having is that I didn't allow for a probe that was offset to the other side of the extruder to mine.

Try these files.
I think it should sort it out.

;setDefaultProbePoints.g - to be called from config.g after Z probe configuration section and any time defaults need to be reset.

var SafeZone = 10 ; probing won't be done closer than this amount from bed edge - adjust as required
var defaultProbeSpacing = 50 ; default mesh grid spacing in mm - adjust as required

; shouldn't need to edit after here
var MinReachableX = max(0,sensors.probes[0].offsets[0]) + var.SafeZone
var MaxReachabeX = move.axes[0].max - abs(sensors.probes[0].offsets[0]) - var.SafeZone
var MinReachableY =  max(0,sensors.probes[0].offsets[1]) + var.SafeZone
var MaxReachabeY = move.axes[1].max - abs(sensors.probes[0].offsets[1]) - var.SafeZone

M557 X{var.MinReachableX,var.MaxReachabeX} Y{var.MinReachableY,var.MaxReachabeY} S{var.defaultProbeSpacing}; define mesh grid
;echo "M557 X"^{var.MinReachableX}^","^{var.MaxReachabeX}, "Y"^{var.MinReachableY}^","^{var.MaxReachabeY}, "S"^{var.defaultProbeSpacing}
if !exists(global.minProbeX)
	global minProbeX = move.compensation.probeGrid.mins[0]
else
	set global.minProbeX = move.compensation.probeGrid.mins[0]

if !exists(global.minProbeY)
	global minProbeY = move.compensation.probeGrid.mins[1]
else
	set global.minProbeY = move.compensation.probeGrid.mins[1]

if !exists(global.maxProbeX)
	global maxProbeX = move.compensation.probeGrid.maxs[0]
else
	set global.maxProbeX = move.compensation.probeGrid.maxs[0]

if !exists(global.maxProbeY)
	global maxProbeY = move.compensation.probeGrid.maxs[1]
else
	set global.maxProbeX = move.compensation.probeGrid.maxs[1]

revised mesh.g

;0:/sys/mesh.g
; run when G29 with no paramters is called.
; if this file not found G29 S0 will run
var SafeZone = 3 ; safety margin for probing near edge.
var MinSpace = 20 ; put default minimum spacing
var MaxSpace = 60 ; put default maximum spacing

; these values are place holders aand will be calculated later
var m557MinX = 40;  ; put your default here
var m557MaxX = 180;  ; put your default here
var m557MinY = 20;  ; put your default here
var m557MaxY = 180;  ; put your default here
var ProbeCenterX = 90 ; will be updated to probe centre of print
var ProbeCenterY = 90 ; will be updated to probe centre of print
var ProbeNumX = 8 ; put default number of probe points
var ProbeNumY = 8 ; put default number probe points.


var MaxProbePoints = max(floor(move.axes[0].max / var.MaxSpace),floor(move.axes[1].max / var.MaxSpace)) ; maximum points in either axis

;echo "Maximum allowed probe points is " ^ var.MaxProbePoints ^ " using max space of " ^ var.MaxSpace


if exists(global.minProbeX)
	if global.minProbeX < max(0,sensors.probes[0].offsets[0]) + var.SafeZone
		echo "minProbeX (" ^ global.minProbeX ^ ") unreachable - reset to " ^ (sensors.probes[0].offsets[0] + var.SafeZone)
		set global.minProbeX = max(0,sensors.probes[0].offsets[0]) + var.SafeZone
	set var.m557MinX = global.minProbeX

if exists(global.maxProbeX)
	if global.maxProbeX < (global.minProbeX + (var.MinSpace*2))
		set global.maxProbeX = (global.minProbeX + (var.MinSpace*2))
	if global.maxProbeX > (move.axes[0].max - abs(sensors.probes[0].offsets[0]) - var.SafeZone)
		echo "maxProbeX (" ^ global.maxProbeX ^ ") unreachable - reset to " ^ (move.axes[0].max - sensors.probes[0].offsets[0] - var.SafeZone)
		set global.maxProbeX = move.axes[0].max - abs(sensors.probes[0].offsets[0]) - var.SafeZone
	set var.m557MaxX = global.maxProbeX

if exists(global.minProbeY)
	if global.minProbeY < max(0,sensors.probes[0].offsets[1]) + var.SafeZone
		echo "minProbeY (" ^ global.minProbeY ^ ") unreachable - reset to " ^ (sensors.probes[0].offsets[1] + var.SafeZone)
		set global.minProbeY = max(0,sensors.probes[0].offsets[1]) + var.SafeZone
	set var.m557MinY = global.minProbeY


if exists(global.maxProbeY)
	if global.maxProbeY < (global.minProbeY + (var.MinSpace*2))
		set global.maxProbeY = (global.minProbeY + (var.MinSpace*2))
	if global.maxProbeY > (move.axes[1].max - abs(sensors.probes[0].offsets[1]) - var.SafeZone)
		echo "maxProbeY (" ^ global.maxProbeY ^ ") unreachable - reset to " ^ (move.axes[1].max - sensors.probes[0].offsets[1] - var.SafeZone)
		set global.maxProbeY = (move.axes[1].max - abs(sensors.probes[0].offsets[1]) - var.SafeZone)
	set var.m557MaxY = global.maxProbeY

echo "Probing grid - X" ^ var.m557MinX ^ ":" ^ var.m557MaxX ^ " Y" ^ var.m557MinY ^ ":" ^ var.m557MaxY

var MinProbesX = floor((var.m557MaxX - var.m557MinX) / var.MaxSpace)
;echo "Min Probes X is " ^ var.MinProbesX

var MaxProbesX = floor((var.m557MaxX - var.m557MinX) / var.MinSpace)
;echo "Max Probes X is " ^ var.MaxProbesX

set var.ProbeNumX = min(var.MaxProbePoints,var.MaxProbesX)

var MinProbesY = floor((var.m557MaxY - var.m557MinY) / var.MaxSpace)
;echo "Min Probes Y is " ^ var.MinProbesY

var MaxProbesY = floor((var.m557MaxY - var.m557MinY) / var.MinSpace)
;echo "Max Probes Y is " ^ var.MaxProbesY

set var.ProbeNumY = min(var.MaxProbePoints,var.MaxProbesY)

; sanity check probe points
if var.ProbeNumX<2
	set var.ProbeNumX=2
if var.ProbeNumY<2
	set var.ProbeNumY=2

if var.ProbeNumX > var.MaxProbePoints
	set var.ProbeNumX = var.MaxProbePoints

if var.ProbeNumY > var.MaxProbePoints
	set var.ProbeNumY = var.MaxProbePoints

if (var.ProbeNumX * var.ProbeNumY) > 441
	if var.ProbeNumX > 21
		set var.ProbeNumX = 21
		echo "Too many X points - reduced to 21"
	if var.ProbeNumY > 21
		set var.ProbeNumY = 21
		echo "Too many Y points - reduced to 21"
	
echo "Probing " ^ var.ProbeNumX ^ " points in X direction & " ^ var.ProbeNumY ^ " points in Y direction"

;check state of heaters
var bedState = heat.heaters[0].state
var bedActiveTemp = heat.heaters[0].active
var bedStandbyTemp = heat.heaters[0].standby
var nozzleState = heat.heaters[1].state
M140 P0 S-276 ; turn off bed heater
M568 P0 A0 ; turn off nozzle heater

; do probing
set var.ProbeCenterX = (global.maxProbeX - ((global.maxProbeX - global.minProbeX)/2)) ; calculate centre point of probe area
set var.ProbeCenterY = (global.maxProbeY - ((global.maxProbeY - global.minProbeY)/2)) ; calculate centre point of probe area
echo "Setting Z datum point at X" ^ var.ProbeCenterX ^ " Y" ^ var.ProbeCenterY
; set Z = 0 to centre of probe area
G1 X{var.ProbeCenterX- sensors.probes[0].offsets[0]} Y{var.ProbeCenterY- sensors.probes[0].offsets[1]} Z{sensors.probes[0].diveHeight+2} F3600
G30
echo "Mesh probing"
M557 X{var.m557MinX,var.m557MaxX} Y{var.m557MinY,var.m557MaxY} P{var.ProbeNumX,var.ProbeNumY}
if result != 0
	abort "ERROR: could not create mesh" 
else
	G29 S0
	if result != 0
		abort "ERROR: Mesh probing failed"
	else
		echo "Mesh probing successful.   Loading mesh.."

; set Z = 0 to centre of probe area
echo "Reset Z datum in mesh centre"
G1 X{var.ProbeCenterX - sensors.probes[0].offsets[0]} Y{var.ProbeCenterY - sensors.probes[0].offsets[1]} Z{sensors.probes[0].diveHeight+2} F3600
G30

; turn the heaters back on if needed
if var.bedState != "off"
	M140 S{var.bedActiveTemp} R{var.bedStandbyTemp}
	if var.bedState="active"
		M144 P0 S1 ; put bed on active temp
	else
		M144 P0 S0 ; put bed on standby temp
if var.nozzleState	!= "off"
	if var.nozzleState = "active"
		M568 P0 A2 ; set nozzle to active
	else
		M568 P0 A1 ; set nozzle to standby

dc42

@ratrig0331 the minimum spacing between points allowed is 0.1mm in each of X and Y. "Spacing too small" means you have tried to specify a smaller spacing than that.

OwenD

@dc42 said in Only probe where the part will be printed:

the minimum spacing between points allowed is 0.1mm in each of X and Y. "Spacing too small" means you have tried to specify a smaller spacing than that.

In that case I'm at a bit of a loss how @RatRig0331 is getting that error using my code.
It's early morning here (Australia) and I have to go to work, so I can't look at till I get home.
@RatRig0331 Can you please un-comment all the lines in the mesh.g that show the calculations and post the output from the console.

At the start I work out the maximum possible number of probes if a full bed was done using maxSpace.
Later I use the object size to recalculate the number of probes also using maxSpacing.
The lesser of these two numbers is used (or should be).

There must be a fundamental flaw in my logic (at least with your bed size and probe configuration).

It also occurs to me that I haven't catered for deltas or printers where X0, Y0 is in the center of the bed.

RatRig0331

@owend

8/15/2022, 8:04:58 PM Error: M557: bad grid definition: Spacing too small
8/15/2022, 8:04:26 PM Reset Z datum in mesh centre
8/15/2022, 8:04:26 PM Mesh probing successful. Loading mesh..
8/15/2022, 8:04:26 PM 36 points probed, min error -0.141, max error 0.093, mean -0.020, deviation 0.066
Height map saved to file 0:/sys/heightmap.csv
8/15/2022, 8:01:59 PM Mesh probing
8/15/2022, 8:01:50 PM Setting Z datum point at X250.0000 Y250.0000
8/15/2022, 8:01:50 PM Probing 6 points in X direction & 6 points in Y direction
8/15/2022, 8:01:50 PM Probing grid - X183.907:316.093 Y188.907:311.093
8/15/2022, 8:01:32 PM Leadscrew adjustments made: -0.014 0.008 0.009, points used 3, (mean, deviation) before (0.001, 0.010) after (-0.000, 0.000)
8/15/2022, 8:01:12 PM Leadscrew adjustments made: 0.015 0.022 0.001, points used 3, (mean, deviation) before (0.014, 0.008) after (-0.000, 0.000)
8/15/2022, 8:00:52 PM Leadscrew adjustments made: 0.102 0.033 -0.002, points used 3, (mean, deviation) before (0.046, 0.040) after (0.000, 0.000)
8/15/2022, 8:00:32 PM Leadscrew adjustments made: 0.503 0.279 0.452, points used 3, (mean, deviation) before (0.404, 0.087) after (-0.000, 0.000)
8/15/2022, 7:58:35 PM M32 "0:/gcodes/First_Layer_Test_0.2mm_PLA_10mhhhhhhhhhhhhhh.gcode"
File 0:/gcodes/First_Layer_Test_0.2mm_PLA_10mhhhhhhhhhhhhhh.gcode selected for printing

RatRig0331

@owend

8/15/2022, 8:17:42 PM Error: M557: bad grid definition: Spacing too small
8/15/2022, 8:17:10 PM Reset Z datum in mesh centre
8/15/2022, 8:17:10 PM Mesh probing successful. Loading mesh..
8/15/2022, 8:17:10 PM 36 points probed, min error -0.105, max error 0.079, mean -0.005, deviation 0.044
Height map saved to file 0:/sys/heightmap.csv
8/15/2022, 8:14:43 PM Mesh probing
8/15/2022, 8:14:34 PM Setting Z datum point at X250.0000 Y250.0000
8/15/2022, 8:14:34 PM Probing 6 points in X direction & 6 points in Y direction
8/15/2022, 8:14:34 PM Max Probes Y is 6
8/15/2022, 8:14:34 PM Min Probes Y is 2
8/15/2022, 8:14:34 PM Max Probes X is 6
8/15/2022, 8:14:34 PM Min Probes X is 2
8/15/2022, 8:14:34 PM Probing grid - X183.907:316.093 Y188.907:311.093
8/15/2022, 8:14:34 PM Maximum allowed probe points is 8 using max space of 60
8/15/2022, 8:14:16 PM Leadscrew adjustments made: 0.002 0.008 0.006, points used 3, (mean, deviation) before (0.005, 0.002) after (0.000, 0.000)
8/15/2022, 8:13:56 PM Leadscrew adjustments made: 0.016 0.016 0.011, points used 3, (mean, deviation) before (0.015, 0.002) after (0.000, 0.000)
8/15/2022, 8:13:36 PM Leadscrew adjustments made: 0.168 0.055 0.022, points used 3, (mean, deviation) before (0.084, 0.057) after (-0.000, 0.000)
8/15/2022, 8:13:16 PM Leadscrew adjustments made: 0.413 0.322 0.388, points used 3, (mean, deviation) before (0.372, 0.035) after (0.000, 0.000)
8/15/2022, 8:12:01 PM M32 "0:/gcodes/First_Layer_Test_0.2mm_PLA_10mhhhhhhhhhhhhhh.gcode"
File 0:/gcodes/First_Layer_Test_0.2mm_PLA_10mhhhhhhhhhhhhhh.gcode selected for printing

OwenD

@ratrig0331
The M557 that is causing the error seems to be well after all the stuff I did.
Check for an M557 somewhere else in your slicer start gcode

RatRig0331

@owend

your right sorry it was in my start code purge line for some reason thank you so much for your time and patients with me this is all still vary new to me

8/15/2022, 9:22:31 PM Reset Z datum in mesh centre
8/15/2022, 9:22:31 PM Mesh probing successful. Loading mesh..
8/15/2022, 9:22:31 PM 36 points probed, min error -0.174, max error 0.083, mean -0.012, deviation 0.067
Height map saved to file 0:/sys/heightmap.csv
8/15/2022, 9:20:04 PM Mesh probing
8/15/2022, 9:19:56 PM Setting Z datum point at X250.0000 Y250.0000
8/15/2022, 9:19:55 PM Probing 6 points in X direction & 6 points in Y direction
8/15/2022, 9:19:55 PM Max Probes Y is 6
8/15/2022, 9:19:55 PM Min Probes Y is 2
8/15/2022, 9:19:55 PM Max Probes X is 6
8/15/2022, 9:19:55 PM Min Probes X is 2
8/15/2022, 9:19:55 PM Probing grid - X183.907:316.093 Y188.907:311.093
8/15/2022, 9:19:55 PM Maximum allowed probe points is 8 using max space of 60
8/15/2022, 9:19:55 PM Leadscrew adjustments made: -0.003 0.011 0.016, points used 3, (mean, deviation) before (0.007, 0.007) after (-0.000, 0.000)
8/15/2022, 9:19:34 PM Leadscrew adjustments made: 0.006 -0.003 0.004, points used 3, (mean, deviation) before (0.002, 0.003) after (0.000, 0.000)
8/15/2022, 9:19:14 PM Leadscrew adjustments made: 0.046 0.021 0.031, points used 3, (mean, deviation) before (0.032, 0.009) after (-0.000, 0.000)
8/15/2022, 9:18:54 PM Leadscrew adjustments made: -0.011 0.368 0.277, points used 3, (mean, deviation) before (0.213, 0.149) after (-0.000, 0.000)

RatRig0331

@owend

sorry one more question so far every time the start code hits your lines the hotend and bed turn off during the mesh than back on after. i tryed moving some things around but it still turns off all heaters during the mesh. here is my full start code

BED_TEMP=[first_layer_bed_temperature]
G90 ; use absolute coordinates
M83 ; extruder relative mode
M140 S[first_layer_bed_temperature] ; set final bed temp
M104 S150 ; set temporary nozzle temp to prevent oozing during homing and auto bed leveling
G4 S10 ; allow partial nozzle warmup
G28 ; home all axis
G1 Z50 F240
G1 X50 Y50 F3000
M116 ; Wait for all temps to stabilise
G32; (TRIM BED)
G32; (TRIM BED)
G32; (TRIM BED)
G32; (TRIM BED)

;;;;;;auto probe print area only;;;;;;

set global.minProbeX = {first_layer_print_min[0]}
set global.maxProbeX = {first_layer_print_max[0]}
set global.minProbeY = {first_layer_print_min[1]}
set global.maxProbeY = {first_layer_print_max[1]}
M561 ; clear any bed transform
M140 S[first_layer_bed_temperature] ; set final bed temp
M104 S150 ; set temporary nozzle temp to prevent oozing during homing and auto bed leveling
G4 S10 ; allow partial nozzle warmup
G29 ; do mesh for printed area
G29 S1 ; load small mesh
G01 X0 Y{"{move.axes[1].max}"} Z0.6 F1500 ; Move to back corner while heating
M568 P{current_extruder} R{"{heat.coldExtrudeTemperature+5}"} S{first_layer_temperature[current_extruder]} A2 ; (set standby and active temperatures for active tool. Standby is 5 degrees above cold extrude temp )
M116 ; Wait for all temps to stabilise

;;;;final temp and purge line;;;;

M104 S{first_layer_temperature[initial_extruder]+extruder_temperature_offset[initial_extruder]} ; set final nozzle temp
M190 S[first_layer_bed_temperature] ; wait for bed temp to stabilize
M109 S{first_layer_temperature[initial_extruder]+extruder_temperature_offset[initial_extruder]} ; wait for nozzle temp to stabilize
G4 S10 ; allow partial nozzle warmup
G1 Z2.0 F3000; (MOVE Z AXIS UP LITTLE)
G1 X0.1 Y20 Z0.35 F5000.0; (MOVE TO PURDGE START)
G1 X0.1 Y200.0 Z0.35 F1500.0 E25; (DRAW FIRST LINE)
G1 X0.4 Y200.0 Z0.35 F5000.0; (MOVE TO THE SECOND LINE)
G1 X0.4 Y20.0 Z0.35 F1500.0 E30; (DRAW SECOND LINE)
G92 E0; (EXTRUDER RESET)

OwenD

@ratrig0331
The turning off of the heaters is deliberate and is done in mesh.g
I find that the accuracy of my bltouch suffers if they are on when probing
I run a 240v bed.
I'll have a look later and add an option to not turn off heaters.

dc42

@owend you can turn off heaters temporarily during probing by using the B1 parameter in your M558 command.

OwenD

@dc42
Roger that..
That makes that section of code superfluous.
Does it turn off the bed heater as well?

OwenD

@ratrig0331 said in Only probe where the part will be printed:

You can remove these lines in your slicer as you have set your temps elsewhere in your start code.

M568 P{current_extruder} R{"{heat.coldExtrudeTemperature+5}"} S{first_layer_temperature[current_extruder]} A2 ; (set standby and active temperatures for active tool.  Standby is 5 degrees above cold extrude temp )
M116 ; Wait for all temps to stabilise

This version removes all the code related to heating from mesh.g

;0:/sys/mesh.g
; run when G29 with no paramters is called.
; if this file not found G29 S0 will run
var SafeZone = 3 ; safety margin for probing near edge.
var MinSpace = 20 ; put default minimum spacing
var MaxSpace = 60 ; put default maximum spacing

; these values are place holders aand will be calculated later
var m557MinX = 40;  ; put your default here
var m557MaxX = 180;  ; put your default here
var m557MinY = 20;  ; put your default here
var m557MaxY = 180;  ; put your default here
var ProbeCenterX = 90 ; will be updated to probe centre of print
var ProbeCenterY = 90 ; will be updated to probe centre of print
var ProbeNumX = 8 ; put default number of probe points
var ProbeNumY = 8 ; put default number probe points.


var MaxProbePoints = max(floor(move.axes[0].max / var.MaxSpace),floor(move.axes[1].max / var.MaxSpace)) ; maximum points in either axis

;echo "Maximum allowed probe points is " ^ var.MaxProbePoints ^ " using max space of " ^ var.MaxSpace


if exists(global.minProbeX)
	if global.minProbeX < max(0,sensors.probes[0].offsets[0]) + var.SafeZone
		echo "minProbeX (" ^ global.minProbeX ^ ") unreachable - reset to " ^ (sensors.probes[0].offsets[0] + var.SafeZone)
		set global.minProbeX = max(0,sensors.probes[0].offsets[0]) + var.SafeZone
	set var.m557MinX = global.minProbeX

if exists(global.maxProbeX)
	if global.maxProbeX < (global.minProbeX + (var.MinSpace*2))
		set global.maxProbeX = (global.minProbeX + (var.MinSpace*2))
	if global.maxProbeX > (move.axes[0].max - abs(sensors.probes[0].offsets[0]) - var.SafeZone)
		echo "maxProbeX (" ^ global.maxProbeX ^ ") unreachable - reset to " ^ (move.axes[0].max - sensors.probes[0].offsets[0] - var.SafeZone)
		set global.maxProbeX = move.axes[0].max - abs(sensors.probes[0].offsets[0]) - var.SafeZone
	set var.m557MaxX = global.maxProbeX

if exists(global.minProbeY)
	if global.minProbeY < max(0,sensors.probes[0].offsets[1]) + var.SafeZone
		echo "minProbeY (" ^ global.minProbeY ^ ") unreachable - reset to " ^ (sensors.probes[0].offsets[1] + var.SafeZone)
		set global.minProbeY = max(0,sensors.probes[0].offsets[1]) + var.SafeZone
	set var.m557MinY = global.minProbeY


if exists(global.maxProbeY)
	if global.maxProbeY < (global.minProbeY + (var.MinSpace*2))
		set global.maxProbeY = (global.minProbeY + (var.MinSpace*2))
	if global.maxProbeY > (move.axes[1].max - abs(sensors.probes[0].offsets[1]) - var.SafeZone)
		echo "maxProbeY (" ^ global.maxProbeY ^ ") unreachable - reset to " ^ (move.axes[1].max - sensors.probes[0].offsets[1] - var.SafeZone)
		set global.maxProbeY = (move.axes[1].max - abs(sensors.probes[0].offsets[1]) - var.SafeZone)
	set var.m557MaxY = global.maxProbeY

echo "Probing grid - X" ^ var.m557MinX ^ ":" ^ var.m557MaxX ^ " Y" ^ var.m557MinY ^ ":" ^ var.m557MaxY

var MinProbesX = floor((var.m557MaxX - var.m557MinX) / var.MaxSpace)
;echo "Min Probes X is " ^ var.MinProbesX

var MaxProbesX = floor((var.m557MaxX - var.m557MinX) / var.MinSpace)
;echo "Max Probes X is " ^ var.MaxProbesX

set var.ProbeNumX = min(var.MaxProbePoints,var.MaxProbesX)

var MinProbesY = floor((var.m557MaxY - var.m557MinY) / var.MaxSpace)
;echo "Min Probes Y is " ^ var.MinProbesY

var MaxProbesY = floor((var.m557MaxY - var.m557MinY) / var.MinSpace)
;echo "Max Probes Y is " ^ var.MaxProbesY

set var.ProbeNumY = min(var.MaxProbePoints,var.MaxProbesY)

; sanity check probe points
if var.ProbeNumX<2
	set var.ProbeNumX=2
if var.ProbeNumY<2
	set var.ProbeNumY=2

if var.ProbeNumX > var.MaxProbePoints
	set var.ProbeNumX = var.MaxProbePoints

if var.ProbeNumY > var.MaxProbePoints
	set var.ProbeNumY = var.MaxProbePoints

if (var.ProbeNumX * var.ProbeNumY) > 441
	if var.ProbeNumX > 21
		set var.ProbeNumX = 21
		echo "Too many X points - reduced to 21"
	if var.ProbeNumY > 21
		set var.ProbeNumY = 21
		echo "Too many Y points - reduced to 21"
	
echo "Probing " ^ var.ProbeNumX ^ " points in X direction & " ^ var.ProbeNumY ^ " points in Y direction"


; do probing
set var.ProbeCenterX = (global.maxProbeX - ((global.maxProbeX - global.minProbeX)/2)) ; calculate centre point of probe area
set var.ProbeCenterY = (global.maxProbeY - ((global.maxProbeY - global.minProbeY)/2)) ; calculate centre point of probe area
echo "Setting Z datum point at X" ^ var.ProbeCenterX ^ " Y" ^ var.ProbeCenterY
; set Z = 0 to centre of probe area
G1 X{var.ProbeCenterX- sensors.probes[0].offsets[0]} Y{var.ProbeCenterY- sensors.probes[0].offsets[1]} Z{sensors.probes[0].diveHeight+2} F3600
G30
echo "Mesh probing"
M557 X{var.m557MinX,var.m557MaxX} Y{var.m557MinY,var.m557MaxY} P{var.ProbeNumX,var.ProbeNumY}
if result != 0
	abort "ERROR: could not create mesh" 
else
	G29 S0
	if result != 0
		abort "ERROR: Mesh probing failed"
	else
		echo "Mesh probing successful.   Loading mesh.."

; set Z = 0 to centre of probe area
echo "Reset Z datum in mesh centre"
G1 X{var.ProbeCenterX - sensors.probes[0].offsets[0]} Y{var.ProbeCenterY - sensors.probes[0].offsets[1]} Z{sensors.probes[0].diveHeight+2} F3600
G30