Voron Trident first layer issue

General Discussion
1

Basic Information:

Printer Model: Voron Trident
MCU / Printerboard: BTT Octopus Controller Board
Host / SBC: Raspberry Pi 3B
klippy.log
klippy.log (1.5 MB)

I have a Voron Trident with a klicky probe. I have completed the initial calibration using documented procedure. I need to fine tune the first layer height. I make a test run and update the Z-offset using the mailsail interface to get the proper offset and then save the offset. I checked the printer.cfg file and I can see the updated value for the “position_endstop”. The number is more negative (more space between the bed and the nozzle). I run the test print again and there is no change to the first layer problem (it is still to thin). I have repeated this effert several time with no change to the first layer height. It seems like I have something wrong with my printer.cfg file and the code is not seeing the change in the “position_endstop” value.

Again, I am saving the change. I see the change in the printer.config file, but there is no change to the first layer problem. Ugh:(

Thanks,

Lauren

P.S. other than this first layer issue all is working ok.

2

Hello @ljr8378 !

You may check this guide:

3

I do not really understand your problem description.

The position_endstop is not variable and dictated by your hardware. You need to follow Bed leveling - Klipper documentation and the associated guides, e.g. Probe calibration - Klipper documentation to define and save your z_offset

4

I did use the “Ellis Print Tuning Guide” (using the sheet of paper, etc.). I have used the bed leveling procedure.

I need to fine tune the Z-offset to get a correct first layer (after the initial calibration with the paper method). I print a test print (a 75x75x0.2 mm cube) I am able to change the offset of the toolhead to the plate using the “Z-offset” of the Toolhead drop down.

This will correct the z-offset issue (to the correct ply thickness). When I press the “save” after the change to the Z-offset, the printer.cfg file is updated with the new value to the “## position_endstop = -1.050". Note, it does not change the value of the "## z_offset = 6.140”

When I reprint the test cube, I still have the same too thin of a first ply thickness issue. This is after the printer.cfg file has the “#*# position_endstop = -1.050” updated to the new value.

I have used the published procedures for fine tuning the first ply thickness with no luck.

5

Is it intended that you use the endstop for homing and the probe only for bed meshing?

6

Take in account that the command for saving the z_offset with z-endstops is different to the one when using a probe for homing.

  • With probe: Z_OFFSET_APPLY_PROBE
  • With endstop: Z_OFFSET_APPLY_ENDSTOP

And of course followed by a SAVE_CONFIG

7

I correct the first ply layer with the “SET_GCODE_OFFSET Z_ADJUST” command. Then I use the “Z_OFFSET_APPLY_ENDSTOP” and the “SAVE_CONFIG” commands. After the printer reboots I check the printer.cfg file and I see “## position_endstop" has changed to the proper value. The problem is that when I rerun the test file I get the same thin first ply problem. I have rerun the test file several times with the "## position_endstop” changing (-0.074 to -0.090 to -0.102 …) everytime, but resulting in the same problem.

As far as I can tell I am doing everything correctly, so I am at my wits end. All I can think to do now is to reload all of the software and start from scratch. Bummer

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