Only probe where the part will be printed

[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

[OwenD]

@RatRig0331

While I was thinking about how to make these macros "universal" to suit all sorts of configurations, it occurred to me that they had, over time, grown ever more complicated with little benefit.
Bed sizes and the probe positions don't tend to change after all.

I have therefore decided to simplify things.

I still call "setDefaultProbePoints.g" from config.g and anywhere else I might want to set the mesh for the entire bed.
Rather than me trying to calculate the area that can be probed, you just enter your M557 just as you would normally do in config.g

;setDefaultProbePoints.g
M557 X10:470 Y10:470 P6 ; set values as you would normally do in config.g

In superslicer, rather than call G29, I call mesh.g using M98, but pass the parameters for the min/max print values and the distance between probe points
A=xMin of print area
B=xMax of print area
C=yMin of print area
D=yMax of print area
N=distance between probe points (equivalent to S parameter in M557)

M98 P"0:/sys/mesh.g" A{first_layer_print_min[0]} B{first_layer_print_max[0]} C{first_layer_print_min[1]} D{first_layer_print_max[1]} N30 ; set N to your desired distance between points
G29 S1 ; load small mesh

In mesh.g I check if all those parameters have been passed.
If they have, I do the small mesh.
If they haven't I reload the defaults and probe the full bed.
Therefore if you send G29 or select mesh probing in DWC it will do the entire bed even if you forget to reset the defaults.

;mesh.g
M98 P"setDefaultProbePoints.g"
if (exists(param.A) && exists(param.B) && exists(param.C) && exists(param.D) && exists(param.N))
	M557 X{max(move.compensation.probeGrid.mins[0],param.A),min(move.compensation.probeGrid.maxs[0],param.B)} Y{max(move.compensation.probeGrid.mins[1],param.C),min(move.compensation.probeGrid.maxs[1] ,param.D)} S{param.N}
	if result != 0
		abort "Invalid M557 parameters"

G29 S0

If you wanted to set the number of probe points rather than the distance between them just change S{param.N} to P{param.N} in the M557 line in mesh.g

[oozeBot]

This might be useful: https://forum.duet3d.com/topic/29647/you-down-with-opp-oozebot-post-processor

[dc42]

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

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

Yes, it turns all heaters off. In the past it's been the bed heater that causes most of the problems for Z probes, however I suspect that with Revo and similar hot ends the hot end heater might affect Z probes too because of the higher magnetic field they are likely to produce.

[RatRig0331]

@owend I’m getting some mix results with the bed mesh either works out great or works out horrible with driving my nozzle right into the bed I don’t know is doing a 3 point axis bed level is messing with the bed mesh or the last z offset probe touch

[OwenD]

@ratrig0331
There's nothing in the code which can cause intermittent faults such as that you describe.
The problem is either wiring related, electrical interference , or a faulty BlTouch.
You can check if the BlTouch is in an error state or already deployed using the object model, but this only serves to allow you to cancel the process.
You need to find the root cause.
You need to provide details of what is happening exactly. What lights are on the BlTouch. What messages appear in DWC
It's probably better to start a new thread.

[RatRig0331]

@owend I have a Theory to why it’s crashing. My 3 point bed leveling before the new smaller mesh on my 500x500mm bed is just too much of a difference from the outter most points of the bed level to the new inner smaller point bed mesh. I manually moved the three probe points much closer the the center and the mesh looks quite a bit better as well as flatter with less extreams. My z changed quite a bit with this new bed level as well by almost .45mm.

Is there a way to auto ajust the bed level points to be in the same area of the auto bed mesh?

[OwenD]

@ratrig0331

What you're describing doesn't sound right to me.
I suggest you study this page
https://docs.duet3d.com/User_manual/Connecting_hardware/Z_probe_auto_levelling
To get your 3 point levelling right.
The probe points must be near the lead screws.