Is there a 3 Stepper Equivalent to "quad_gantry_level"

General Discussion
1

I’m sure it’s probably somewhere, but I can’t find it. I’ve gone through the docs and looking on line.

I want to set up my printer with three stepper motors at the front two corners and the rear middle with autoleveling but I don’t see anything in the documents that performs this.

“quad_gantry_level” works for four (and I presume its for the Voron 2.4, but I can’t find anything for three.

Thanx for any pointers to the Klipper code for doing this!

2

https://www.klipper3d.org/Config_Reference.html#z_tilt

1 Like
3

Thank you but I’m still not 100% sure how this works.

I did find this: Z_tilt Correction help configuration? · Issue #2857 · Klipper3d/klipper · GitHub which has the problem of the 3 Z Axis motors wired differently than specified in printer.cfg.

So, if I understand things correctly, I first specify my Z, Z1 and Z2 stepper motors and my Z axis probe (which will be a BL touch) in printer.cfg.

Next, I specify z_tilt (Configuration reference - Klipper documentation) with the necessary points and other parameters.

To manually level the system, I will execute the command “Z_TILT_ADJUST” which will use the information I put in printer.cfg.

Now, when I (or the printer itself) issue a “Home” Command (say G28), will the system be leveled as part of the command?

Thanx!

4

It can be, but you would need to include z_tilt_adjust in a homing_override. It’s a fully automated process once you configure it. It will probe your specified points, adjust the motors, and stop once the highest and lowest points are within the tolerance you specify.

5

Thanx - I’m a few days away from trying it out and I’ll update this thread then.

6

The Rat Rig uses this kinematics: V-Core 3 - All 3D Printer Kits - 3D Printing - 3D Printing & CNC
Maybe you can get some infos from there… They use Klipper as well, so there should be existing maths for it.

7

Thanx - I saw the V-Core 3 but I can’t find any Klipper files other than a somewhat vague reference to it here:

Can you point me to anything more substantial?

8

Look here for a basic introduction of the Rat Rig: What is RatOS? | RatOS

I would download and install the image and then look into their Klipper printer config (printer.cfg) there should be the answer.

Else you send a mail to miklschmidt#2036 on the Rat Rig Unofficial Discord

or take a look in the repository here:

maybe you have to search the basic config file a little, the naming seems to be a little different like in klipper…

9

Thank you - that’s what I couldn’t find before.