IDEX Right Head Z adjustment using G10

selva_tvi

Hello all,

IDEX machine with 500x500x500 build volume.

Using Duet 6 XD (X, Y, Z1, Z2, Z3 and U0 with Tool boards for Left and Right hotend

The right hotend is 0.3-0.5mm above than the Left Hotend.

(When Duplicate or Mirror mode, we are managing by giving an extra brim or skirt to adjust this offset.)

When giving Dual prints, we tried to use G10 command.

Scenario 1:
Initially in the config,g, we gave this command:
G10 P1 U24 Y-2 Z0.3

a. Sliced a file with simplify3d. U and Y offsets were working fine.
But with Z, whenever the left and right were printing, it was crashing with its previous layers.

b. Sliced a file with Cura. U and Y offsets were working fine. But for Z, there is no visible change.

Scenario 2:
Initially in the config,g, we gave this command:
G10 P1 U24 Y-2 Z0 (No Z offset)

a. Given the Z offset in the start.g of Cura.
G28
G29
G10 P1 Z0.3
U and Y offsets were working fine. But for Z, there is no visible change.

a. Given the Z offset in Extruder 2 of Cura.
G10 P1 Z0.3
U and Y offsets were working fine. But for Z, there is no visible change.

Dual-Simplify3D.gcode Cura-Z0.3-Start Gcode.gcode Cura-Z0.3-Extruder Gcode.gcode

.Please find the attached Gcodes.

droftarts

@selva_tvi I think the problem is that you are trying to send tool 1 below Z0. The left tool, which I assume is Tool 0, has G10 P0 Z0. When applying offsets:

Tool offsets are given as the offset of the nozzle relative to the print head reference point, so the signs are opposite to what you might expect because tool offsets are subtracted from the required printing locations during printing.

You are using Tool 0 nozzle tip as your 'print head reference point', with Z0 at the tip, but you need to go -0.3 below this for Tool1, which takes it below Z0. I think there are a couple of options:

Set M208 to allow for some negative Z movement, or
Set Tool 0 to G10 P0 Z-0.3, and adjust the Z probe trigger height/homing height, and set Tool 1 to G10 P1 Z0

See also https://docs.duet3d.com/User_manual/Tuning/Defining_tool_and_Z_probe_offsets for a better explanation of using tool offsets.

Realistically if you are printing in duplicate and mirror mode, you will achieve better results by getting both nozzle to the same height.

Ian