Prusa MK4 + Bed Visualizer

[geekstar33]

Hi, I have used your Bed Visualizer with my MK3s... now I have an MK4 and I'm curious if it will work with it? I'm hesitant to simply press the button and find out. I dont want to crash the nozzle or do something else bad.

Please let me know if it will capture the bed level data from an MK4.
thank you,
LM

[jneilliii]

Don't have one so can't confirm or deny. As long as you use the proper gcode for your printer for leveling there should be no issue.

[geekstar33]

Ok... MK4 uses G29. So I changed the collection tab commands to:

@BEDLEVELVISUALIZER
G29 P1

It runs the probe sequence across the bed, but never reports anything graphically. It just continues to say, "Please wait, retrieving current mesh". I have to hit cancel to break out of it. Any ideas, what I'm missing?

[jneilliii]

Those command look suspiciously similar to UBL. Try the command M420 V in terminal command.

[geekstar33]

Thank you so much for your responses!

I updated the collection button to this:
@BEDLEVELVISUALIZER ; instruct plugin to start recording responses from printer.
G29 P1
@BEDLEVELVISUALIZER
M420 V

Watching the terminal...
It does each probe point successfully reporting "clean and ok" with each touch point.
At the end of probing, it displays a chart of numbers in the terminal.
But at the end of the chart numbers it says this...

Recv: Mesh is invalid
Recv: Storage slot: 0
Recv: echo:Invalid mesh.
Recv: echo:Bed Leveling OFF
Recv: echo:Fade Height OFF
Recv: ok

On the Bed Visualizer tab, it does not update the graphics and still says, "Please wait, retreiving current mesh"... but never completes.

Hoping to solve this for other MK4 users too....

[geekstar33]

UPDATE:

Ok... I got something... I looked at what the Prusa Slicer was using in the start gcode: here is the updated collection code I used...

@BEDLEVELVISUALIZER ; instruct plugin to start recording responses from printer.
G29 P1
G29 P3.2 ; interpolate mbl probes
G29 P3.13 ; extrapolate mbl outside probe area
G29 A ; activate mbl
M420 V

the graphics were rendered... but wow! It gave back a lot of points and the MK4 suprisingly had a large variance. Although MK4 does a great job with bed leveling... its still nice to see what is going on with the bed.

I believe it needed the G29 P3.2 to interpolate and make a valid mesh.

Hopefully this will help others. Feedback still appreciated.

[jneilliii]

You should move the command @BEDLEVELVISUALIZER just before the M420 V command I think.

[mt-mrx]

Thanks for this post. With the following instructions I get a proper visualization.

; Prusa MK4
G29 P1
G29 P3.2 ; interpolate mbl probes
G29 P3.13 ; extrapolate mbl outside probe area
G29 A ; activate mbl
@BEDLEVELVISUALIZER ; instruct plugin to start recording responses from printer.
M420 V