True Bed Leveling

@TDK said in True Bed Leveling:

in which you can see the bed is clearly non-planar. A warped frame or non-planar XY motion could also cause this.

Initially you said "Your bed is warped".

You seem to have amended your analysis.

Frederick

Touché

ErwinH78

Hey Guys..... sorry for my late answer and thx a lot for help.

the issue was really caused by the Y-rails. i fixed that and with the result i´m very happy.

what do you think?

fcwilt

@ErwinH78 said in True Bed Leveling:

Hey Guys..... sorry for my late answer and thx a lot for help.

the issue was really caused by the Y-rails. i fixed that and with the result i´m very happy.

Glad to hear you got it working.

Frederick

@ErwinH78 said in True Bed Leveling:

Hey Guys..... sorry for my late answer and thx a lot for help.

the issue was really caused by the Y-rails. i fixed that and with the result i´m very happy.

what do you think?

Glad to see you got it fixed and glad to see the very flat milled tool plate was not warped as some fool tried to tell you.

@fcwilt said in True Bed Leveling:

@CaLviNx said in True Bed Leveling:

Looking at the pic the rails are inverted, the X/Y carriage hang down underneath?

this being so then the rail/extrusion needs to be lowered not raised, as from the height map that corner is showing the nozzle to be rising up

Hmm...

I just did a four point height map putting a metal plate along the front edge of the bed ensuring it was placed so that the probe triggered on it at both front corners.

The height map indicated that the front of the bed has higher than the back by the thickness of the plate.

So if "raising" the bed did that wouldn't lowering the front ends of extrusions/rails have the same effect?

Frederick

Sorry i didnt see your comment until now.

As you correctly pointed out that the frame is not "level"

The height map was showing that the rear of the LEFT Y axis rail was "higher" than the rear of the right one so that when the nozzle traversed closer to that point it (the nozzle) started to climb away from the bed which the graphic was showing happening.

Good practice would be to level the surface the printer is sitting (and built) on and then that way you know that when you assemble the frame it is going to be level with the surface it is on is already level, But in the real world that is not always possible.

Which is why i said to build using digital inclinometers zero'ed to the build surface, that means the printer will always be in sync with the build surface and that way zero will be relative zero relative to the surface the printer is sitting on, even if it isn't actually absolute zero but things will at least be perpendicular and parallel to the surface the printer will spend its life on.

Unless of course you have adjustable feet on the printer you can then set everything to absolute zero