What does this message imply?

peirof

Hi,

just ask what this message means in the DWC console ...

Warning: the height map was loaded when the current Z=0 datum was not determined probing. This may result in a height offset.

I explain the procedure to you, I almost always do the same.

1- I turn on the printer
2- I preheat the bed and the nozzle to a temperature close to the printing temperature
3- I apply hairspray on the bed
4- With the DWC I run a G32, to calibrate the bed
5- Once calibrated, I raise the temperatures for printing
6- Meanwhile, I adjust the dimension 0, since the calibration gives a result 2 mm, approximately low
7- PRINT

This is the procedure, when everything goes well ...

I used to use the same or similar procedure before, and it doesn't sound like I have seen this message. I think it comes out since I update to version 3 of the firmware

Thx

Phaedrux

It means that you've loaded a saved heightmap before you've homed Z with the probe, and so you may get an unexpected offset.

fcwilt

@peirof

To set the Z=0 Datum you use a single G30 command at a fixed XY position.

Some folks use a point on the grid used to create the height map. Some use the center of the bed - I'm one of those folks.

There are three situations when you must set the Z=0 Datum for accurate results:

after leveling the bed using G32
before creating the height map using G29 S0
before loading the height map using G29 S1

If the Z=0 Datum setting used to create the height map is different from the Z=0 Datum setting used to load the height map you can get that error message.

Frederick

peirof

@fcwilt

hi,

mmm .... I've been doing it wrong for a long time ... that's why maybe in each print I had to adjust Z = 0, since after calibrating it was about 3 mm high.

I expose here how I did it, so you can tell me what I'm doing wrong, and how I can improve it:

1- From time to time, when I change something in the printer, or when it has been approximately 2 months, I do this:
1.a. - Preheating bed and nozzle
1 B. - I do: "Homedelta.g", in DWC
1 C. - I calibrate the printer with "G32" (DWC)
1.d. - I run a bed compesation "G29"

2- Before printing
2.1. - Preheating bed and nozzle
2.2. - I do: "Homedelta.g", in DWC
2.3. - I calibrate the printer with "G32" (DWC)
2.4. - I adjust the Z = 0 manually, with DWC, since it is about 3 mm high
2.5. - I print the gcode, where in the "Start gcode", is "G29 S1"

From what I read, it is not a better system .... Could you tell me which is the best procedure?

Thanks

Phaedrux

What do you have in bed.g?

The only thing you really need to do is have a G30 to set the Z0 position with the probe before you create or load a mesh heightmap and start the print. As long as your G31 Z trigger height is correct of course.