Printer head crashing when running Z tilt or bed mesh

General Discussion
1

Custom Corexy large format.
Bigtreetech Octopus
klippy.log (71.2 KB)
printer(1).cfg (21.2 KB)

Hello I am having issues ruing the Z tilt on a large format Corexy 3D printer. The printer is homing as it should. But the issues start when I go and run the Z tilt program instead of dropping the bed down a few MM so the nozzle can clear the bed when it is traveling to its first probe point the bed moves up a few MM and crashes. I have been trying to fix this issue for some time now but no luck. The only thing I can think of that may to Causing this to happen is that the four z stepper motors or on top of the printer instead of the bottom of the printer where they are located on most over printers. Dose any one have any ideas on this.
The printer config fille is based on a Voron trident.

2

Hello @Felixj86 !

[z_tilt]
z_positions = 
	-25, 25   # <-  A
	475, 25
	475, 475
	25, 475    # <- B
points = 
	25, 25
	475, 25
	475, 475
	25, 475
speed = 10
horizontal_move_z = 10
retries = 5
retry_tolerance = 0.0075

One of the lines A or B is wrong.

Also: You are sure that the measuring points are exact above the pivot points?

3

@EddyMI3D Thank you for your response, Line A was wrong so thank you for pointing out that. How ever the bed still moves up before the print head moves to these positions and the crashing as there is not enough distance between the nozzles. So I need to work out how to command the bed to move down 5 or 10 mm before it stars probing points.

4

Maybe it is this section that is wrong:

[safe_z_home]
##  XY Location of the Z Endstop Switch
##  Update -10,-10 to the XY coordinates of your endstop pin 
##  (such as 157,305) after going through Z Endstop Pin
##  Location Definition step.
home_xy_position:235,235
speed:10
z_hop:-10

In fact the negative z_hop.
The bed or nozzle should gain distance to the respective other but this looks like it wants to decrease the distance.

5

@LifeOfBrian From my testing I think these only effects the homing of the bed. And not the z tilt as no matter if the number is positive or negative the bed still moves towards the nozzle when leveling the bed.

6

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