Marlin firmware fork for MakerFarm i3v w/ auto bed level & Roxy's enhancements

[inventabuild]

Hi Roxy,

In pins.h I have the Case Fan defined:
#define FAN2_PIN 2 //Fan2 --- Case Fan

I need to run this fan so my stepper drivers don't overheat. Please let me know where the lines are that turn this fan on and set its speed?

Also, please let me know where is the "temperature.c - temperature control" tab? It doesn't show across the top or in the drop down arrow selection.

[clough42]

Clough??? Did adding the Z_RAISE_AFTER_PROBING fix the problem?

Thanks, Roxy. It's working well for me. I've got about 35 hours of continuous printing on it now, and its looking solid.

I do have a little oddity with the bed leveling I can't figure out. The probe results show that the bed is not flat. The readings at the right edge and the middle of the bed are just about the same, but the readings at the left edge are a tenth of a mm or so lower. But with a straightedge and .05mm feeler gauge, it seems completely flat to me.

It's odd, and it after the leveling, the z seems to rise linearly when moving to the left, so stuff on the left side of the bed doesn't adhere well.

I would have expected the opposite, dropping as it moves left, compromising on the first layer being tight in the middle..

I can't get the diagnostics right now, because it's currently printing.

[clough42]

Okay, here's the output of G29:

Send: G29
Recv: G29 Auto Bed Leveling
Recv: Eqn coefficients: a: 0.00184583 b: 0.00039097 d: 4.03347873
Recv: planeNormal x: -0.001846 y: -0.000391 z: 1.000000
Recv: 
Recv: 
Recv: Bed Level Correction Matrix:
Recv: +0.999998 +0.000000 +0.001846
Recv: -0.000001 +1.000000 +0.000391
Recv: -0.001846 -0.000391 +0.999998
Recv: ok

If I'm reading this correctly, the Z height of the bed varies the most in the X direction, and the normal vector tilts toward negative X, meaning the bed is higher at the positive X edge of the bed.

And the printer does seem to be moving this way. When it moves in the positive X direction, the head moves upward (the +0.001846) term in the [0,2] matrix cell.

But I think my bed is actually lower at the positive X edge, so I'm confused why it's doing this.

Is there an easy way to see the actual probe Z coordinates it's reading? That would help me to determine if something is really wrong here or if it's just doing its best with a warped bed or X axis.

I tried M111 S32. Heck, I even tried M111 S255, but didn't get anything more from G29 than what you see above.

[Roxy]

Doing a Topography report would be helpful. Something like G29 V4 P5 T That will give you a map of the height of the bed at different points.

but the readings at the left edge are a tenth of a mm or so lower. But with a straightedge and .05mm feeler gauge, it seems completely flat to me.

It's odd, and it after the leveling, the z seems to rise linearly when moving to the left, so stuff on the left side of the bed doesn't adhere well.

I think that is tell you that the extruder is not moving perfectly flat or linearly.

[clough42]

Doing a Topography report would be helpful. Something like G29 V4 P5 T That will give you a map of the height of the bed at different points.


I think that is tell you that the extruder is not moving perfectly flat or linearly.

Yeah...I think you're right. It's printing now, so I'll have to check tomorrow, but I'll bet that the X axis extrusions are either not parallel, causing the X carriage plate to flex, or the wheels on the X carriage are too tight, causing the extrusions to flex.

A few minutes with a digital caliper will tell the tale.

I have to take a step back for perspective sometimes. I'm dealing with a machine here that I put together out of plywood and off-the-shelf hardware, not to mention a pile of parts made by the very machine itself, and I'm chasing a misalignment that's probably half a tenth of a millimeter. Pretty crazy.

[clough42]

Doing a Topography report would be helpful. Something like G29 V4 P5 T That will give you a map of the height of the bed at different points.


I think that is tell you that the extruder is not moving perfectly flat or linearly.

Got a topography report. If I'm reading this correctly, I have a bow in both directions, which is probably a glass or mounting issue, right?

Also, since 0,0 is in the back, right corner, are the matrices rotated 180 degrees?

Send: M80
Recv: ok
[...]
Send: G28
Recv: ok
[...]
Send: G29 V4 P5 T
Recv: G29 Auto Bed Leveling
Recv: Bed X: 30.000 Y: 30.000 Z: 3.448
Recv: Bed X: 90.000 Y: 30.000 Z: 3.686
Recv: Bed X: 150.000 Y: 30.000 Z: 3.851
Recv: Bed X: 210.000 Y: 30.000 Z: 3.952
Recv: Bed X: 270.000 Y: 30.000 Z: 3.997
Recv: Bed X: 270.000 Y: 90.000 Z: 3.996
Recv: Bed X: 210.000 Y: 90.000 Z: 3.974
Recv: Bed X: 150.000 Y: 90.000 Z: 3.879
Recv: Bed X: 90.000 Y: 90.000 Z: 3.742
Recv: Bed X: 30.000 Y: 90.000 Z: 3.492
Recv: Bed X: 30.000 Y: 150.000 Z: 3.569
Recv: Bed X: 90.000 Y: 150.000 Z: 3.816
Recv: Bed X: 150.000 Y: 150.000 Z: 3.927
Recv: Bed X: 210.000 Y: 150.000 Z: 4.007
Recv: Bed X: 270.000 Y: 150.000 Z: 4.044
Recv: Bed X: 270.000 Y: 210.000 Z: 4.000
Recv: Bed X: 210.000 Y: 210.000 Z: 4.013
Recv: Bed X: 150.000 Y: 210.000 Z: 3.947
Recv: Bed X: 90.000 Y: 210.000 Z: 3.834
Recv: Bed X: 30.000 Y: 210.000 Z: 3.634
Recv: Bed X: 30.000 Y: 270.000 Z: 3.601
Recv: Bed X: 90.000 Y: 270.000 Z: 3.780
Recv: Bed X: 150.000 Y: 270.000 Z: 3.900
Recv: Bed X: 210.000 Y: 270.000 Z: 3.970
Recv: Bed X: 270.000 Y: 270.000 Z: 3.981
Recv: Eqn coefficients: a: 0.00186917 b: 0.00031375 d: 3.51421260
Recv: Mean of sampled points: 3.84165048
Recv: planeNormal x: -0.001869 y: -0.000314 z: 1.000000
Recv:
Recv: Bed Height Topography:
Recv: +-----------+
Recv: |...Back....|
Recv: |Left..Right|
Recv: |...Front...|
Recv: +-----------+
Recv: -0.24115 -0.06140 +0.05835 +0.12860 +0.13910
Recv: -0.20715 -0.00765 +0.10510 +0.17160 +0.15835
Recv: -0.27265 -0.02565 +0.08585 +0.16560 +0.20235
Recv: -0.34990 -0.09965 +0.03785 +0.13285 +0.15435
Recv: -0.39390 -0.15590 +0.00960 +0.11010 +0.15535
Recv:
Recv:
Recv: Corrected Bed Height vs. Bed Topology:
Recv: +0.07745 +0.14505 +0.15265 +0.11075 +0.00910
Recv: +0.13028 +0.21763 +0.21823 +0.17258 +0.04718
Recv: +0.08360 +0.21845 +0.21780 +0.18540 +0.11000
Recv: +0.02517 +0.16328 +0.18862 +0.17147 +0.08083
Recv: +0.00000 +0.12585 +0.17920 +0.16755 +0.10065
Recv:
Recv:
Recv:
Recv: Bed Level Correction Matrix:
Recv: +0.999998 +0.000000 +0.001869
Recv: -0.000001 +1.000000 +0.000314
Recv: -0.001869 -0.000314 +0.999998
Recv: ok

[clough42]

I just reran the report with the bed freshly heated and again after soaking. It warps another .05mm when heating and then settles somewhere in between. Time to start swapping glass and adjusting insulation, I suppose.

[Roxy]

Recv: -0.24115 -0.06140 +0.05835 +0.12860 +0.13910
Recv: -0.20715 -0.00765 +0.10510 +0.17160 +0.15835
Recv: -0.27265 -0.02565 +0.08585 +0.16560 +0.20235
Recv: -0.34990 -0.09965 +0.03785 +0.13285 +0.15435
Recv: -0.39390 -0.15590 +0.00960 +0.11010 +0.15535

That's interesting... I didn't know there was a Corrected Bed Height vs. Bed Topology:
section to the report. That is new. I'll have to look at the code to see what that is doing. But if the report is orientated correctly for your bed it is saying the front left is almost .4mm below the mean and the front right is .15mm above the mean. Going diagonally, you have .5mm of difference from front left to back right. And .4mm difference from back left to front right. That is a lot. The Auto Bed Leveling should be able to adjust for that, but you will get better prints if you physically adjust out some of that error.

At this point if you manually adjust your bed to bring all those numbers closer to zero, you will be able to see if there is a warp or a bulge in the bed. What will happen in the case of a warp or bulge is you will see a row or column start off +, go to - and then flip back to +. (or start -, goto +, and then back to -) If you see that on any column or row, you have a non-flat bed and there is some kind of warp. If you see that happen in both a row and a column, it will be likely the intersection of the two is the location of the bulge. But that will only show up on the Topological Map if you have it adjusted closer to level.

[dacb]

Thanks, Roxy. It's working well for me. I've got about 35 hours of continuous printing on it now, and its looking solid.

I do have a little oddity with the bed leveling I can't figure out. The probe results show that the bed is not flat. The readings at the right edge and the middle of the bed are just about the same, but the readings at the left edge are a tenth of a mm or so lower. But with a straightedge and .05mm feeler gauge, it seems completely flat to me.

It's odd, and it after the leveling, the z seems to rise linearly when moving to the left, so stuff on the left side of the bed doesn't adhere well.

I would have expected the opposite, dropping as it moves left, compromising on the first layer being tight in the middle..

I can't get the diagnostics right now, because it's currently printing.

Hi Clough,
Do I take this post to mean that you've been running the most recent version of Marlin with changes to support your geometry and not my old fork? If so, that's great news.

[clough42]

Hi Clough,
Do I take this post to mean that you've been running the most recent version of Marlin with changes to support your geometry and not my old fork? If so, that's great news.

Yes. At the moment, I still have a fork of your fork published and recommended for my customers, but I have been running the RC on one of my production printers for a while now, and it works great.