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A while ago, I created some simple command buttons in Octoprint to help with bed levelling, by hopping to particular points on the bed. I realised that what I actually want to do is move Z up 10mm, move, and then home Z though, to avoid ploughing the nozzle along the bed if the level is badly off.

So I did this:

  - commands:
    - G91
    - G1 Z-10
    - G90
    - G1 X30 Y160 F9000
    - G28 Z
    name: Back Left
    type: command

Which should be, switch to relative move, Move -10mm Z, switch back to absolute, go to the specified point and then home Z.

Except there's no Z move. I get the feeling that something might be optimising the moves together into one, or something similar... how can I get my printer to move up, then across, then down?

(printer is an quite modified Anet A8 i3 clone - I think the board is Melzi-based?)

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  • $\begingroup$ Are you sure that minus 10 corresponds to moving the Z axis up? Shouldn't that bring the nozzle closer to the printbed instead? $\endgroup$ Oct 14, 2017 at 11:15
  • $\begingroup$ You know, I could have sworn I tested that separately! You are quite right... $\endgroup$ Oct 14, 2017 at 13:31

2 Answers 2

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what I actually want to do is move Z up 10mm

The command G1 Z-10 tells the printer to decrease the Z-axis position, i.e., move the nozzle closer to the bed. You should use G1 Z10 instead.

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Thanks in part to Tom van Der Zanden, I got a working version, which I'll paste below to add some actual value to this question! The G1 XY coordinates for each position are for near the corners on a 220x220 bed, but leaving enough room to access a screw in the corner of the bed if you need to (I don't anymore, but my printer did initially) - for different bed sizes, you'll want to change them. Add to ~/.octoprint/config.yml

controls:
- children:
  - commands:
    - M140 S50
    - M104 S190 T0
    name: Preheat
    type: command
  - commands:
    - G91
    - G1 Z10
    - G90
    - G1 X30 Y50 F9000
    - G28 Z0
    name: Front Left
    type: command
  - commands:
    - G91
    - G1 Z10
    - G90
    - G1 X180 Y70 F9000
    - G28 Z0
    name: Front Right
    type: command
  - commands:
    - G91
    - G1 Z10
    - G90
    - G1 X30 Y160 F9000
    - G28 Z0
    name: Back Left
    type: command
  - commands:
    - G91
    - G1 Z10
    - G90
    - G1 X180 Y160 F9000
    - G28 Z0
    name: Back Right
    type: command
  - commands:
    - G91
    - G1 Z10
    - G90
    - G1 X100 Y100 F9000
    - G28 Z0
    name: Centre
    type: command
  layout: horizontal
  name: Levelling

enter image description here

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