Z-Tilt on a Dual Z Axis Bed Slinger

General Discussion
1

Basic Information:

Printer Model: Anycubic i3 Mega S
MCU / Printerboard:

Describe your issue:

So… I’m looking to install Klipper on the printer, as part of a series of upgrades I’m doing. I just had one question I couldn’t seem to find the answer for online and and was wondering if I could get some guidance. In most config flies for the Mega S (I’ll link the one I found below) , it says “Home position is determined by 3DTouch. Z limit switches are not used.” In regards to this, would it become an issue if the Z-Gantry became unlevel, as the dual Z-Switches won’t be able to correct for this. Would this be a problem, how could it be fixed? Both Z steppers are individually controlled, and have an end switch on both sides. Any help/advice would be much appreciated! I’ll add a slightly overexaggerated illustration as well…

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1 Like
2

Two possible solutions:

  • Use probe only for bed meshing and the endstops for homing
  • Use the z-tilt function
1 Like
4

Yeah, I was thinking to only probe for meshing. How easy would it be to modify the config to do this? Sorry for all the questions, I’m just quite new to this…

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[stepper_z]
step_pin = ar46
dir_pin = ar48
enable_pin = !ar62
step_distance = .0025

## for 3dtouch. comment for mannual mesh bed leveling
endstop_pin = probe:z_virtual_endstop
## uncomment below for manual mesh bed leveling and to enable Z limit switches
#endstop_pin = ^!ar18
#position_endstop = 0.0

position_max = 205
homing_speed = 10
homing_retract_dist = 5
second_homing_speed = 3


[stepper_z1]
step_pin = ar36
dir_pin = ar34

## uncomment below for manual mesh bed leveling and to enable Z limit switches
#endstop_pin = ^!ar43

enable_pin = !ar30
step_distance = .0025

All information is already included in the cfg you referenced. See the comments.
Leave the bltouch and mesh settings activated.

Personally, I’d recommend using the z-tilt function.

1 Like
6

My only worry with the z-tilt could be that if it’s the bed isn’t perfectly level, the that would carry over to the gantry I assume?

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Theoretically true, but it is best practice to have your bed as leveled as possible and as long as you are not so much off that you jam your gantry it should not be an issue.

In the end all mechanical imperfections will add up and while Klipper can compensate some, sooner or later you will get strange issues, e.g. location biased issues

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