G30 - Retracting after Z probe triggers
-
I hope everyone is doing well. I am building a small form factor 3D printer for teaching purposes. I am using a John FSR for my Z probe, which is wired to the Z probe connection on the Duet 2 wifi. When I call G30 the print head lowers until it triggers the Z probe. However, after triggering the Z probe the Z axis immediately retracts away from the bed until it reaches its maxima.
Looking at the documentation, this appears to be abnormal behavior. I would expect (and prefer) the Z axis to remain at the probing height after homing.
The bed is very small, so I am only probing the center once. Also, the FSR sits ontop of a 10mm thick aluminum disk, which I move onto the before homing the z axis.
Firmware 2.02
Relevant Code:
Config.g
; General preferences
M208 X-8 Y-7 Z0 S1 ; Set axis minima
M208 X127 Y166 Z80 S0 ; Set axis maxima; Endstops
M574 Z0 S0 ; Define active low and unused microswitches
M574 X1 Y1 S1 ; Define active high microswitches
M558 P5 X0 Y0 Z1 H80 F120 T12000 ;
G31 X0 Y0 Z10.26 ; -
@drdflo said in G30 - Retracting after Z probe triggers:
M558 H80
The dive height is set to 80mm. Try maybe 20?
-
Thanks for the reply Phaedrux, but I don't understand why I should adjust the dive height. Correct me if I am wrong, but isn't the dive height how far the Z-axis should travel before erroring out? If the Z-axis is at its maxima (80mm) and the dive height was 20mm it wouldn't reach the FSR.
Just to reiterate the problem: the z axis returns to the maxima after touching the probe, which wastes time because the print head then has to return back to the bed height before starting the print.
-
G30 will travel until it gets a trigger. The dive height is how high it will return to after it has triggered in preparation for the next probe, for instance when doing a G29 mesh.
-
[Solved]
Thank you for your response! All sorted out.
