[Valentin]

Please ? Can you provide me some information ? I’d really like to make it work again but I have a lot of trouble finding information and tutorial about the hardware…

[Valentin]

Hi !

I would like to do the same – upgrading a makelangelo 2.5 (uno with motor shield) to a mega + ramps, no lcd, no sd, no limit switches (for now).

Did you achieve to make it work ? Which motor drivers are you using ?

Thank you very much !

[Valentin]

Please, any news ? Can’t find a way to get the right scale on the paper, and the offset problem is still present, just less important (but any drawing of more than 5-10min is totally broke). Also tried with new motors, updated software & firmware, same problem…

[Valentin]

Hi, some news :

I divided by two the speed of the motors (hard coded in the firmware, on setSpeed()), because setting the speed from the software does not seem to change anything (maybe I misunderstood how it works).

No more offset problem ! For the first time it passed the top-right-bottom-left test and came back to the home point without any issue 🙂

The motors are making much more noise, but I don’t think this is a problem.

I’m still having issues to calibrate the board : a 100mm vertical line measures 135mm on the paper, and a horizontal one 120mm… In my setting the pulley size is set to 12,7mm (I assume this is the size of the default pulleys from the kit ?) and decreasing it still does not works (the motors won’t turn, sometimes I got NaN exceptions).

But anyway, this is a significant step ! I’ll do more tests and keep you informed. Still have no clue why the default speed made the machine shift.

[Valentin]

I did it a bit too quickly yesterday… please don’t take the result into account 🙂

So, I did the test again, still the same result : the same offset appears when doing diagonals, everything working fine when drawing horizontal & vertical lines.

I’ll try to dig a little more into the arduino code these days.

[Valentin]

I assume you are talking about the dev version of the firmware code, right ? (here https://github.com/MarginallyClever/Makelangelo-firmware/tree/dev ?)

I quickly tried it because I don’t have much time now, didn’t re-calibrate or anything, but this is what I got with the same test :
result

Did I missed something ? Maybe I should also use the dev branch of Makelangelo software, but it looks like it has not been updated since January..

I’ll test it more in depth and keep you informed tomorrow when I’ll have more time 🙂

Thanks for your responsiveness.

[Valentin]

OK, so you think this is software related ? Or is it possible that the motors or the shield may be defective ?
Maybe I could try with an older firmware version ?

[Valentin]

I did the same test two more times : Home > Top > Right > Home > Right > Bottom > Home > Bottom > Left > Home > Left > Top > Home

result 1

result 2

Looks like the offset is more or less constant between each draw.
But sometimes it looks like one of the motors slows down (see result 2 – bottom left to home line).

Then I swapped the motors and did the same test :
result with swapped motors

I still have no clue about what’s wrong in my setup and can’t draw any conclusion of these tests, but maybe it will help you to diagnose the problem…

Thanks again for your help

[Valentin]

Then both horizontal pass are totally misaligned, as every line draw shift a little more.

whoops, I mean :
diagonal passes are totally misaligned*

[Valentin]

After doing some more tests it appears that everything looks fine when it only do vertical and horizontal movements. When it does any diagonal movement it seems to shift more and more.

That’s why crosshatch filter produces glitchy images :
Horizontal pass works fine, then vertical pass is offset (about 1/2cm) but every vertical lines are aligned to each other. Then both horizontal pass are totally misaligned, as every line draw shift a little more.

[Valentin]

I used the last released of the firmware (https://github.com/MarginallyClever/Makelangelo-firmware/releases/tag/1.0.2).
I just tried with the code from the master branch, had to update the Arduino software to make it compile, but the problem is sill happening.

My counterweight are about 90/100g (plastic bottles with 2cm water). The pen holder is not weighted, I tried to add some weight yesterday but it didn’t changed anything.

I don’t really know what I can do now… If you need me to do some tests feel free to send me a gcode and I’ll send you the result back !

[Author]

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