Trouble with Z axis on TAZ 6

1

Hi there,

I posted this on the LulzBot forum first but it might be more appropriate here given the controller/firmware changes…

I’m having trouble getting my TAZ 6 to behave. It seems to put down a layer or two successfully, but then starts mashing the print head into the existing layer.

As part of my troubleshooting I’ve tried the following:

  • Placing the printer on a large tile to ensure it is 100% flat
  • Following Squaring TAZ 6 Frame Workflow
  • Moving the Z axis up to 270 and back down again
  • Replaced the controller board with an Archim2 (including using the heatsink, heatsink compound and heatsink retainer from a TAZ Pro) and Drunken Octopus firmware
  • Increased the current of the Z axis driver up to the point where it will buzz

I’m not sure what I should look at next. Stepper motors, power supply?

The stepper motors and driver both stay very cool, so I don’t think this is the issue.

Has anyone else had this issue? I was really surprised when the controller didn’t fix the issue.

Thank you!

2

Have you verified (M92) the Z-steps per unit (mm)?

This is what I see on my TAZ 6 (with the Rambo controller):

Send: M92
Recv: echo: M92 X100.00 Y100.00 Z1600.00 E844.00
Recv: ok P15 B3

Send: M115
Recv: FIRMWARE_NAME:Marlin  FIRMWARE_VERSION:2.0.9.0.13 EXTRUDER_TYPE:Universal (Aug 10 2022 09:40:12) SOURCE_CODE_URL:https://gitlab.com/lulzbot3d/marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:LulzBot TAZ 6 EXTRUDER_COUNT:1 UUID:845f003c-aebd-4e53-a6b9-7d0984fde609
3

Thanks b-morgan, the setting for Z looks the same as yours:

M92 X100.50 Y100.50 Z1600.00 E846.00
ok P15 B4

FIRMWARE_NAME:Marlin bugfix-2.1.x (Oct  2 2022 15:55:41) SOURCE_CODE_URL:https://github.com/marciot/drunken-octopus-marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:TAZ 6 EXTRUDER_COUNT:1 UUID:845f003c-aebd-4e53-a6b9-7d0984fde609

Is the current for the Z driver meant to be double the X/Y because it is driving two motors? Or are they wired in series?

Cheers

4

I don’t know the answer for the current. It could be two motors or it could be that they are screw threads instead of belts.

5

Turns out I just had the extruder steps set for my other print head and so it was massively over extruding!

The problem was manifesting in the same way as before the controller swap so I jumped to conclusions.

Now we are printing better (and quieter) than ever before!

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