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Enhanced G29

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- Adapted “Enhanced G29” code referred to in #1499 and posted at
[3dprintboard.com](http://3dprintboard.com/showthread.php?3105-Auto_Bed_
Leveling-Enhanced-G29-command)
- Compatible with current G29 while adding some new arguments
  - `V` sets the verbose level for serial out
  - `T` (or `V` > 2) send a Topology report to serial out
  - `E` works the same way as before
  - `P` works as before (source used `n` or `U`/`u`)
  - `L`, `R`, `B`, `F` work as before
- Still needs sanity checking for `LRBF`
master
Scott Lahteine 10 years ago
parent e428e8da75
commit 7684721977
1 changed files with 268 additions and 168 deletions
Show Stats Download Patch File Download Diff File

432
Marlin/Marlin_main.cpp
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@ -1200,22 +1200,24 @@ static void retract_z_probe() {
#endif #endif
} }
enum ProbeAction { ProbeEngageRetract, ProbeEngage, ProbeStay, ProbeRetract };
/// Probe bed height at position (x,y), returns the measured z value /// Probe bed height at position (x,y), returns the measured z value
static float probe_pt(float x, float y, float z_before, int retract_action=0) { static float probe_pt(float x, float y, float z_before, ProbeAction retract_action=ProbeEngageRetract) {
// move to right place // move to right place
do_blocking_move_to(current_position[X_AXIS], current_position[Y_AXIS], z_before); do_blocking_move_to(current_position[X_AXIS], current_position[Y_AXIS], z_before);
do_blocking_move_to(x - X_PROBE_OFFSET_FROM_EXTRUDER, y - Y_PROBE_OFFSET_FROM_EXTRUDER, current_position[Z_AXIS]); do_blocking_move_to(x - X_PROBE_OFFSET_FROM_EXTRUDER, y - Y_PROBE_OFFSET_FROM_EXTRUDER, current_position[Z_AXIS]);
#ifndef Z_PROBE_SLED #ifndef Z_PROBE_SLED
if ((retract_action==0) || (retract_action==1)) if (retract_action == ProbeEngageRetract || retract_action == ProbeEngage) engage_z_probe();
engage_z_probe(); // Engage Z Servo endstop if available #endif
#endif // Z_PROBE_SLED
run_z_probe(); run_z_probe();
float measured_z = current_position[Z_AXIS]; float measured_z = current_position[Z_AXIS];
#ifndef Z_PROBE_SLED
if ((retract_action==0) || (retract_action==3)) #ifndef Z_PROBE_SLED
retract_z_probe(); if (retract_action == ProbeEngageRetract || retract_action == ProbeRetract) retract_z_probe();
#endif // Z_PROBE_SLED #endif
SERIAL_PROTOCOLPGM(MSG_BED); SERIAL_PROTOCOLPGM(MSG_BED);
SERIAL_PROTOCOLPGM(" x: "); SERIAL_PROTOCOLPGM(" x: ");
@ -1376,6 +1378,11 @@ void refresh_cmd_timeout(void)
#endif //FWRETRACT #endif //FWRETRACT
#ifdef Z_PROBE_SLED #ifdef Z_PROBE_SLED
#ifndef SLED_DOCKING_OFFSET
#define SLED_DOCKING_OFFSET 0
#endif
// //
// Method to dock/undock a sled designed by Charles Bell. // Method to dock/undock a sled designed by Charles Bell.
// //
@ -1719,193 +1726,286 @@ void process_commands()
break; break;
#ifdef ENABLE_AUTO_BED_LEVELING #ifdef ENABLE_AUTO_BED_LEVELING
#if Z_MIN_PIN == -1
#error "You must have a Z_MIN endstop in order to enable Auto Bed Leveling!!! Z_MIN_PIN must point to a valid hardware pin."
#endif
/**
* Enhanced G29 Auto Bed Leveling Probe Routine
*
* Parameters With AUTO_BED_LEVELING_GRID:
*
* P Set the size of the grid that will be probed (P x P points).
* Example: "G29 P4"
*
* V Set the verbose level (0-4). Example: "G29 V3"
*
* T Generate a Bed Topology Report. Example: "G29 P5 T" for a detailed report.
* This is useful for manual bed leveling and finding flaws in the bed (to
* assist with part placement).
*
* F Set the Front limit of the probing grid
* B Set the Back limit of the probing grid
* L Set the Left limit of the probing grid
* R Set the Right limit of the probing grid
*
* Global Parameters:
*
* E/e By default G29 engages / disengages the probe for each point.
* Include "E" to engage and disengage the probe just once.
* There's no extra effect if you have a fixed probe.
* Usage: "G29 E" or "G29 e"
*
*/
case 29: // G29 Detailed Z-Probe, probes the bed at 3 or more points. case 29: // G29 Detailed Z-Probe, probes the bed at 3 or more points.
// Override probing area by providing [F]ront [B]ack [L]eft [R]ight Grid[P]oints values {
{ // Use one of these defines to specify the origin
#if Z_MIN_PIN == -1 // for a topographical map to be printed for your bed.
#error "You must have a Z_MIN endstop in order to enable Auto Bed Leveling feature!!! Z_MIN_PIN must point to a valid hardware pin." #define ORIGIN_BACK_LEFT 1
#endif #define ORIGIN_FRONT_RIGHT 2
#define ORIGIN_BACK_RIGHT 3
#define ORIGIN_FRONT_LEFT 4
#define TOPO_ORIGIN ORIGIN_FRONT_LEFT
// Prevent user from running a G29 without first homing in X and Y
if (!(axis_known_position[X_AXIS] && axis_known_position[Y_AXIS])) {
LCD_MESSAGEPGM(MSG_POSITION_UNKNOWN);
SERIAL_ECHO_START;
SERIAL_ECHOLNPGM(MSG_POSITION_UNKNOWN);
break; // abort G29, since we don't know where we are
}
// Prevent user from running a G29 without first homing in X and Y bool enhanced_g29 = code_seen('E') || code_seen('e');
if (! (axis_known_position[X_AXIS] && axis_known_position[Y_AXIS]) )
{
LCD_MESSAGEPGM(MSG_POSITION_UNKNOWN);
SERIAL_ECHO_START;
SERIAL_ECHOLNPGM(MSG_POSITION_UNKNOWN);
break; // abort G29, since we don't know where we are
}
#ifdef Z_PROBE_SLED #ifdef AUTO_BED_LEVELING_GRID
dock_sled(false);
#endif // Z_PROBE_SLED
st_synchronize();
// make sure the bed_level_rotation_matrix is identity or the planner will get it incorectly
//vector_3 corrected_position = plan_get_position_mm();
//corrected_position.debug("position before G29");
plan_bed_level_matrix.set_to_identity();
vector_3 uncorrected_position = plan_get_position();
//uncorrected_position.debug("position durring G29");
current_position[X_AXIS] = uncorrected_position.x;
current_position[Y_AXIS] = uncorrected_position.y;
current_position[Z_AXIS] = uncorrected_position.z;
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
setup_for_endstop_move();
feedrate = homing_feedrate[Z_AXIS]; // Example Syntax: G29 N4 V2 E T
#ifdef AUTO_BED_LEVELING_GRID int verbose_level = 1;
// probe at the points of a lattice grid
int left_probe_bed_position=LEFT_PROBE_BED_POSITION;
int right_probe_bed_position=RIGHT_PROBE_BED_POSITION;
int back_probe_bed_position=BACK_PROBE_BED_POSITION;
int front_probe_bed_position=FRONT_PROBE_BED_POSITION;
int auto_bed_leveling_grid_points=AUTO_BED_LEVELING_GRID_POINTS;
if (code_seen('L')) left_probe_bed_position=(int)code_value();
if (code_seen('R')) right_probe_bed_position=(int)code_value();
if (code_seen('B')) back_probe_bed_position=(int)code_value();
if (code_seen('F')) front_probe_bed_position=(int)code_value();
if (code_seen('P')) auto_bed_leveling_grid_points=(int)code_value();
int xGridSpacing = (right_probe_bed_position - left_probe_bed_position) / (auto_bed_leveling_grid_points-1); bool topo_flag = code_seen('T') || code_seen('t');
int yGridSpacing = (back_probe_bed_position - front_probe_bed_position) / (auto_bed_leveling_grid_points-1);
if (code_seen('V') || code_seen('v')) {
verbose_level = code_value();
if (verbose_level < 0 || verbose_level > 4) {
SERIAL_PROTOCOLPGM("?Verbose Level not plausible (0-4).\n");
break;
}
if (verbose_level > 0) {
SERIAL_PROTOCOLPGM("Enhanced G29 Auto_Bed_Leveling Code V1.25:\n");
SERIAL_PROTOCOLPGM("Full support at http://3dprintboard.com\n");
if (verbose_level > 2) topo_flag = true;
}
}
// solve the plane equation ax + by + d = z int auto_bed_leveling_grid_points = code_seen('P') ? code_value_long() : AUTO_BED_LEVELING_GRID_POINTS;
// A is the matrix with rows [x y 1] for all the probed points if (auto_bed_leveling_grid_points < 2 || auto_bed_leveling_grid_points > AUTO_BED_LEVELING_GRID_POINTS) {
// B is the vector of the Z positions SERIAL_PROTOCOLPGM("?Number of probed points not plausible (2 minimum).\n");
// the normal vector to the plane is formed by the coefficients of the plane equation in the standard form, which is Vx*x+Vy*y+Vz*z+d = 0 break;
// so Vx = -a Vy = -b Vz = 1 (we want the vector facing towards positive Z }
// "A" matrix of the linear system of equations int left_probe_bed_position = code_seen('L') ? code_value_long() : LEFT_PROBE_BED_POSITION;
double eqnAMatrix[auto_bed_leveling_grid_points*auto_bed_leveling_grid_points*3]; int right_probe_bed_position = code_seen('R') ? code_value_long() : RIGHT_PROBE_BED_POSITION;
int back_probe_bed_position = code_seen('B') ? code_value_long() : BACK_PROBE_BED_POSITION;
int front_probe_bed_position = code_seen('F') ? code_value_long() : FRONT_PROBE_BED_POSITION;
// "B" vector of Z points #endif
double eqnBVector[auto_bed_leveling_grid_points*auto_bed_leveling_grid_points];
#ifdef Z_PROBE_SLED
dock_sled(false); // engage (un-dock) the probe
#endif
st_synchronize();
// make sure the bed_level_rotation_matrix is identity or the planner will get it incorectly
//vector_3 corrected_position = plan_get_position_mm();
//corrected_position.debug("position before G29");
plan_bed_level_matrix.set_to_identity();
vector_3 uncorrected_position = plan_get_position();
//uncorrected_position.debug("position durring G29");
current_position[X_AXIS] = uncorrected_position.x;
current_position[Y_AXIS] = uncorrected_position.y;
current_position[Z_AXIS] = uncorrected_position.z;
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
setup_for_endstop_move();
int probePointCounter = 0; feedrate = homing_feedrate[Z_AXIS];
bool zig = true;
for (int yProbe=front_probe_bed_position; yProbe <= back_probe_bed_position; yProbe += yGridSpacing) #ifdef AUTO_BED_LEVELING_GRID
// probe at the points of a lattice grid
{ int xGridSpacing = (right_probe_bed_position - left_probe_bed_position) / (auto_bed_leveling_grid_points - 1);
int xProbe, xInc; int yGridSpacing = (back_probe_bed_position - front_probe_bed_position) / (auto_bed_leveling_grid_points - 1);
if (zig)
{
xProbe = left_probe_bed_position;
//xEnd = right_probe_bed_position;
xInc = xGridSpacing;
zig = false;
} else // zag
{
xProbe = right_probe_bed_position;
//xEnd = left_probe_bed_position;
xInc = -xGridSpacing;
zig = true;
}
for (int xCount=0; xCount < auto_bed_leveling_grid_points; xCount++) // solve the plane equation ax + by + d = z
{ // A is the matrix with rows [x y 1] for all the probed points
float z_before; // B is the vector of the Z positions
if (probePointCounter == 0) // the normal vector to the plane is formed by the coefficients of the plane equation in the standard form, which is Vx*x+Vy*y+Vz*z+d = 0
{ // so Vx = -a Vy = -b Vz = 1 (we want the vector facing towards positive Z
// raise before probing
z_before = Z_RAISE_BEFORE_PROBING; int abl2 = auto_bed_leveling_grid_points * auto_bed_leveling_grid_points;
} else
{ double eqnAMatrix[abl2 * 3], // "A" matrix of the linear system of equations
// raise extruder eqnBVector[abl2], // "B" vector of Z points
z_before = current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS; mean = 0.0;
}
int probePointCounter = 0;
float measured_z; bool zig = true;
//Enhanced G29 - Do not retract servo between probes
if (code_seen('E') || code_seen('e') ) for (int yProbe = front_probe_bed_position; yProbe <= back_probe_bed_position; yProbe += yGridSpacing) {
{ int xProbe, xInc;
if ((yProbe==FRONT_PROBE_BED_POSITION) && (xCount==0))
{ if (zig)
measured_z = probe_pt(xProbe, yProbe, z_before,1); xProbe = left_probe_bed_position, xInc = xGridSpacing;
} else if ((yProbe==FRONT_PROBE_BED_POSITION + (yGridSpacing * (AUTO_BED_LEVELING_GRID_POINTS-1))) && (xCount == AUTO_BED_LEVELING_GRID_POINTS-1)) else
{ xProbe = right_probe_bed_position, xInc = -xGridSpacing;
measured_z = probe_pt(xProbe, yProbe, z_before,3);
} else { // If topo_flag is set then don't zig-zag. Just scan in one direction.
measured_z = probe_pt(xProbe, yProbe, z_before,2); // This gets the probe points in more readable order.
} if (!topo_flag) zig = !zig;
} else {
measured_z = probe_pt(xProbe, yProbe, z_before); for (int xCount = 0; xCount < auto_bed_leveling_grid_points; xCount++) {
} // raise extruder
float z_before = probePointCounter == 0 ? Z_RAISE_BEFORE_PROBING : current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS,
eqnBVector[probePointCounter] = measured_z; measured_z;
eqnAMatrix[probePointCounter + 0*auto_bed_leveling_grid_points*auto_bed_leveling_grid_points] = xProbe; // Enhanced G29 - Do not retract servo between probes
eqnAMatrix[probePointCounter + 1*auto_bed_leveling_grid_points*auto_bed_leveling_grid_points] = yProbe; ProbeAction act;
eqnAMatrix[probePointCounter + 2*auto_bed_leveling_grid_points*auto_bed_leveling_grid_points] = 1; if (enhanced_g29) {
probePointCounter++; if (yProbe == front_probe_bed_position && xCount == 0)
xProbe += xInc; act = ProbeEngage;
} else if (yProbe == front_probe_bed_position + (yGridSpacing * (auto_bed_leveling_grid_points - 1)) && xCount == auto_bed_leveling_grid_points - 1)
act = ProbeRetract;
else
act = ProbeStay;
} }
clean_up_after_endstop_move(); else
act = ProbeEngageRetract;
// solve lsq problem measured_z = probe_pt(xProbe, yProbe, z_before, act);
double *plane_equation_coefficients = qr_solve(auto_bed_leveling_grid_points*auto_bed_leveling_grid_points, 3, eqnAMatrix, eqnBVector);
SERIAL_PROTOCOLPGM("Eqn coefficients: a: "); mean += measured_z;
SERIAL_PROTOCOL(plane_equation_coefficients[0]);
SERIAL_PROTOCOLPGM(" b: ");
SERIAL_PROTOCOL(plane_equation_coefficients[1]);
SERIAL_PROTOCOLPGM(" d: ");
SERIAL_PROTOCOLLN(plane_equation_coefficients[2]);
eqnBVector[probePointCounter] = measured_z;
eqnAMatrix[probePointCounter + 0 * abl2] = xProbe;
eqnAMatrix[probePointCounter + 1 * abl2] = yProbe;
eqnAMatrix[probePointCounter + 2 * abl2] = 1;
set_bed_level_equation_lsq(plane_equation_coefficients); probePointCounter++;
xProbe += xInc;
free(plane_equation_coefficients); } //xProbe
#else // AUTO_BED_LEVELING_GRID not defined } //yProbe
// Probe at 3 arbitrary points clean_up_after_endstop_move();
// Enhanced G29
float z_at_pt_1, z_at_pt_2, z_at_pt_3; // solve lsq problem
double *plane_equation_coefficients = qr_solve(abl2, 3, eqnAMatrix, eqnBVector);
mean /= abl2;
if (verbose_level) {
SERIAL_PROTOCOLPGM("Eqn coefficients: a: ");
SERIAL_PROTOCOL(plane_equation_coefficients[0]);
SERIAL_PROTOCOLPGM(" b: ");
SERIAL_PROTOCOL(plane_equation_coefficients[1]);
SERIAL_PROTOCOLPGM(" d: ");
SERIAL_PROTOCOLLN(plane_equation_coefficients[2]);
if (verbose_level > 2) {
SERIAL_PROTOCOLPGM("Mean of sampled points: ");
SERIAL_PROTOCOL_F(mean, 6);
SERIAL_PROTOCOLPGM(" \n");
}
}
if (code_seen('E') || code_seen('e')) { if (topo_flag) {
// probe 1
z_at_pt_1 = probe_pt(ABL_PROBE_PT_1_X, ABL_PROBE_PT_1_Y, Z_RAISE_BEFORE_PROBING,1);
// probe 2
z_at_pt_2 = probe_pt(ABL_PROBE_PT_2_X, ABL_PROBE_PT_2_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS,2);
// probe 3
z_at_pt_3 = probe_pt(ABL_PROBE_PT_3_X, ABL_PROBE_PT_3_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS,3);
}
else {
// probe 1
z_at_pt_1 = probe_pt(ABL_PROBE_PT_1_X, ABL_PROBE_PT_1_Y, Z_RAISE_BEFORE_PROBING);
// probe 2
z_at_pt_2 = probe_pt(ABL_PROBE_PT_2_X, ABL_PROBE_PT_2_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS);
// probe 3
z_at_pt_3 = probe_pt(ABL_PROBE_PT_3_X, ABL_PROBE_PT_3_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS);
}
clean_up_after_endstop_move();
set_bed_level_equation_3pts(z_at_pt_1, z_at_pt_2, z_at_pt_3);
int xx, yy;
#endif // AUTO_BED_LEVELING_GRID SERIAL_PROTOCOLPGM(" \nBed Height Topography: \n");
st_synchronize(); #if TOPO_ORIGIN == ORIGIN_FRONT_LEFT
for (yy = auto_bed_leveling_grid_points - 1; yy >= 0; yy--)
#else
for (yy = 0; yy < auto_bed_leveling_grid_points; yy++)
#endif
{
#if TOPO_ORIGIN == ORIGIN_BACK_RIGHT
for (xx = auto_bed_leveling_grid_points - 1; xx >= 0; xx--)
#else
for (xx = 0; xx < auto_bed_leveling_grid_points; xx++)
#endif
{
int ind =
#if TOPO_ORIGIN == ORIGIN_BACK_RIGHT || TOPO_ORIGIN == ORIGIN_FRONT_LEFT
yy * auto_bed_leveling_grid_points + xx
#elif TOPO_ORIGIN == ORIGIN_BACK_LEFT
xx * auto_bed_leveling_grid_points + yy
#elif TOPO_ORIGIN == ORIGIN_FRONT_RIGHT
abl2 - xx * auto_bed_leveling_grid_points - yy - 1
#endif
;
float diff = eqnBVector[ind] - mean;
if (diff >= 0.0)
SERIAL_PROTOCOLPGM(" +"); // Watch column alignment in Pronterface
else
SERIAL_PROTOCOLPGM(" -");
SERIAL_PROTOCOL_F(diff, 5);
} // xx
SERIAL_PROTOCOLPGM("\n");
} // yy
SERIAL_PROTOCOLPGM("\n");
// The following code correct the Z height difference from z-probe position and hotend tip position. } //topo_flag
// The Z height on homing is measured by Z-Probe, but the probe is quite far from the hotend.
// When the bed is uneven, this height must be corrected.
real_z = float(st_get_position(Z_AXIS))/axis_steps_per_unit[Z_AXIS]; //get the real Z (since the auto bed leveling is already correcting the plane)
x_tmp = current_position[X_AXIS] + X_PROBE_OFFSET_FROM_EXTRUDER;
y_tmp = current_position[Y_AXIS] + Y_PROBE_OFFSET_FROM_EXTRUDER;
z_tmp = current_position[Z_AXIS];
apply_rotation_xyz(plan_bed_level_matrix, x_tmp, y_tmp, z_tmp); //Apply the correction sending the probe offset
current_position[Z_AXIS] = z_tmp - real_z + current_position[Z_AXIS]; //The difference is added to current position and sent to planner. set_bed_level_equation_lsq(plane_equation_coefficients);
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]); free(plane_equation_coefficients);
#ifdef Z_PROBE_SLED
dock_sled(true, -SLED_DOCKING_OFFSET); // correct for over travel. #else // !AUTO_BED_LEVELING_GRID
#endif // Z_PROBE_SLED
// Probe at 3 arbitrary points
float z_at_pt_1, z_at_pt_2, z_at_pt_3;
if (enhanced_g29) {
// Basic Enhanced G29
z_at_pt_1 = probe_pt(ABL_PROBE_PT_1_X, ABL_PROBE_PT_1_Y, Z_RAISE_BEFORE_PROBING, ProbeEngage);
z_at_pt_2 = probe_pt(ABL_PROBE_PT_2_X, ABL_PROBE_PT_2_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS, ProbeStay);
z_at_pt_3 = probe_pt(ABL_PROBE_PT_3_X, ABL_PROBE_PT_3_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS, ProbeRetract);
} }
break; else {
z_at_pt_1 = probe_pt(ABL_PROBE_PT_1_X, ABL_PROBE_PT_1_Y, Z_RAISE_BEFORE_PROBING);
z_at_pt_2 = probe_pt(ABL_PROBE_PT_2_X, ABL_PROBE_PT_2_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS);
z_at_pt_3 = probe_pt(ABL_PROBE_PT_3_X, ABL_PROBE_PT_3_Y, current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS);
}
clean_up_after_endstop_move();
set_bed_level_equation_3pts(z_at_pt_1, z_at_pt_2, z_at_pt_3);
#endif // !AUTO_BED_LEVELING_GRID
st_synchronize();
if (verbose_level > 0)
plan_bed_level_matrix.debug(" \n\nBed Level Correction Matrix:");
// The following code correct the Z height difference from z-probe position and hotend tip position.
// The Z height on homing is measured by Z-Probe, but the probe is quite far from the hotend.
// When the bed is uneven, this height must be corrected.
real_z = float(st_get_position(Z_AXIS)) / axis_steps_per_unit[Z_AXIS]; //get the real Z (since the auto bed leveling is already correcting the plane)
x_tmp = current_position[X_AXIS] + X_PROBE_OFFSET_FROM_EXTRUDER;
y_tmp = current_position[Y_AXIS] + Y_PROBE_OFFSET_FROM_EXTRUDER;
z_tmp = current_position[Z_AXIS];
apply_rotation_xyz(plan_bed_level_matrix, x_tmp, y_tmp, z_tmp); //Apply the correction sending the probe offset
current_position[Z_AXIS] = z_tmp - real_z + current_position[Z_AXIS]; //The difference is added to current position and sent to planner.
plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
#ifdef Z_PROBE_SLED
dock_sled(true, -SLED_DOCKING_OFFSET); // dock the probe, correcting for over-travel
#endif
}
break;
#ifndef Z_PROBE_SLED #ifndef Z_PROBE_SLED
case 30: // G30 Single Z Probe case 30: // G30 Single Z Probe
{ {

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