I've read a lot of posts in regard to these subjects but I think that the advice is just so saturated it's hard to know what to follow.
I've had trouble with my bed min pos and x/y probe offsets ever since I installed the two fan version of the Hero Me 5. I followed the advice in the manual and uncomment MANUAL_Y_HOME_POS -9 to account for the width of the mount, but ever since then I can't get prints centered on my plate, and with the suggested probe offsets for the mount I used as X -60, Y -13, the BLTouch still won't probe the plate evenly, which is causing (I believe) the front left and front right corner to print unevenly.
I've tried remeasuring the offsets using the x and y coordinates on the printer and subtracting out the nozzle coordinates, didn't work. I tried printing a 100x100 mm square and measuring the left and right x differences and the top to bottom y differences, subtracting, dividing by 2, and updating that new value via M206 and M500, that didn't work.
I tried homing the nozzle to the actual x0, y0 position in the bottom left corner and using M428 to try and save that, but that didn't work. The only thing I was able to get to work and print fairly evenly (it's still off by a few mm on each side) is to use the code settings I have below and sending a M206 Y-11 M500 command which has it almost straight.
I tried updating that in the firmware and re-flashing but that reverted back to being uneven and my BLTouch still probes unevenly (bed visualizer is showing all green though. I also tried adjusting the Y endstop, but the bed started slamming into the end of the axis and grinding the belt a bit
So after that long-winded explanation, my question is how do I get my x/y to 0/0 in the bottom left corner, print evenly, and probe evenly, is it best to zero out everything and start measurements from scratch? I also ran an M48 test to rule out the probe and the returned values came back in line. My code is below for reference. Set up is Ender 3 Pro, 4.2.7 Creality board, Marlin Bug fix 2.0, BLTouch model v3.1, glass Ped plate, Hero Me 5 duct system.
Also just another side question, when you load new firmware, what is erased and what is updated? If I adjust these new values below, do I always need to load settings from EEPROM and save to over write everything old?
/ Direction of endstops when homing; 1=MAX, -1=MIN// :[-1,1]
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1//
'@section machine// The size of the print bed
#define X_BED_SIZE 235
#define Y_BED_SIZE 235// Travel limits (mm) after homing, corresponding to endstop positions.
#define X_MIN_POS -6.5 (Previous defaults for both where 0 and 0)
#define Y_MIN_POS -11.5
#define Z_MIN_POS 0
#define X_MAX_POS X_BED_SIZE
#define Y_MAX_POS Y_BED_SIZE
#define Z_MAX_POS 250
#define NOZZLE_TO_PROBE_OFFSET {-61, -15, -0.60 }// Most probes should stay away from the edges of the bed, but// with NOZZLE_AS_PROBE this can be negative for a wider probing area.
#define PROBING_MARGIN 10// X and Y axis travel speed (mm/min) between probes
#define XY_PROBE_SPEED (100*60)// Feedrate (mm/min) for the first approach when double-probing (MULTIPLE_PROBING == 2)
#define Z_PROBE_SPEED_FAST (4*60)// Feedrate (mm/min) for the "accurate" probe of each point
#define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
/ Manually set the home position. Leave these undefined for automatic settings.// For DELTA this is the top-center of the Cartesian print volume.//
#define MANUAL_X_HOME_POS 0
#define MANUAL_Y_HOME_POS -9//
#define MANUAL_Z_HOME_POS 0
G-code adjustment sent, M206 y-11 M500
