Home_xy_position for bed center parameters don’t match bedsize

[Benito020]

Basic Information:

Printer Model: ender 3 max
MCU / Printerboard: BIGTREETECH MANTA E3EZ
klippy.log

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Describe your issue:

Hi

The issue that I have is that the configuration when homing to the center of my bed for my home_xy_position. Doesn’t match with the size of my bed, that is 300 by 300 in the x and y. So as a parameter it should be home_xy_position: 150,150 but it doesn’t home to the center and crashes outside the given parameters.But when I change it to home_xy_position: 75,75 it does home to the center. What might be the cause? And I don’t receive an error log when the parameters are 150,150

When I make a bed mesh It does probes the full size of the bed with the right offsets in the bed_mesh section. But when the mesh is done it displays the result on a board with the size of 150 by 150(see screenshot)

[EddyMI3D]

Hello @Benito020 !

Without the klippy.log there is no chance to find any clue what is going wrong.

[Benito020]

Hi @EddyMI3D

Thnx for reply, I’ve added a klipper log. But that’s only because i changed the parameters in the‘position_endstop’ in the stepper_x section. Which shouldn’t happen as well.
klippy.log (2.7 MB)

[EddyMI3D]

@Benito020

So as a parameter it should be home_xy_position: 150,150 but it doesn’t home to the center

Don’t mix up homing of X/Y and homing of Z

X and Y must home to the border of the bed.

You have a BTtouch, so you usually use [safe_z_home]

[safe_z_home]
home_xy_position = 150,150   # <- correct values.
speed = 35
z_hop = 10
z_hop_speed = 5

[stepper_x]
step_pin = PA14
dir_pin = !PA10
enable_pin = !PA13
microsteps = 16
rotation_distance = 40
full_steps_per_rotation = 200
endstop_pin = ^PC4
position_endstop = 150  # <--- On an Ender, this is 0
position_min = 0
position_max = 300
homing_speed = 50
homing_retract_dist = 5

More on printer limits and homing:

Understanding X and Y Axes Limits and Homing

The X and Y Axis Klipper needs to know from its printer.cfg settings how far the X and Y axes can safely move without hitting the printer’s frame. It also needs to know where the origin (X=0 / Y=0) is. This origin is the beginning of the usable printer bed. In the following, we assume a Cartesian printer that follows the conventions of a Cartesian Coordinate System. This is also the reason why it is a quasi-standard to define the origin as the left-front corner of the bed. This way, all logic…

[Benito020]

The x and y do home to the end of the bed(end stops)but the z doesn’t end in the middle when calibrating in klipper. But it does with:

[safe_z_home]
home_xy_position = 75,75 # ← with this value the z axis stops in the center(calibrated)
speed = 35
z_hop = 10
z_hop_speed = 5

I’ve changed the ‘position_endstop:’ so that a klippy log would appear