Uneven layers

droftarts

@droftarts no it's using the same kinematics at the markforge printer.

So not a CoreXY, but when you move just one motor (X or Y), the print head moves at 45º? To move the print head along the X axis, both X and Y motor have to turn? So if one axis is loose, the layers will shift at 45º. You've got something loose on one of your axes.

Ian

Haggan90

@droftarts to move the X axis only the X motor has to turn, but moving Y requires bot X and Y motors to turn.

droftarts

@Haggan90 said in Uneven layers:

@droftarts to move the X axis only the X motor has to turn, but moving Y requires bot X and Y motors to turn.

Yes, I see. But this still means that layers can shift by 45 degrees, as well as 90 degrees, and that either axis could be causing this. But the shift you’re seeing also returns to the original position; it’s limited in its movement. So it HAS to be mechanical slop/backlash, as other effects eg motor settings causing skipped steps would cause more random movement of layers. I’d look at all pulley and belts, which are probably solidly mounted most of the time, except for occasional highest load changes of direction. One way to test this would be to print the same object at half speed.

Ian

OBELIKS

That is why I suggested to print it rotated by 45° That way you can see which axis is acting up.

Haggan90

@OBELIKS this is printed in 45°!

Left printed at 45°, right regular.

Veti

your white belts are with steel and may be broken.

i agree with JoergS5. if not now you will face problems with those white belts soon because of the 180 degree turn.

Haggan90

I'm beginning to think this may have something to do with the fact that I'm using a Volcano hot end, could that be the case here?

OBELIKS

The strange thing is that this happens at the same height when you compare 45° and normal orientation, so I think it is not the extruder or fillament. It also means it is not X or Y axis.

droftarts

I had some similar Z wobble problems when I updated my Cartesian machine to two independent Z motors. I spent ages looking for bent rods, loose axes, but then it was pointed out that I'd made a massive noob mistake and put M584 Set drive mapping after the motor settings! This causes any axes that don't have accelerations, jerk etc set to use default values, which may work just well enough to fool you into thinking you set it right, and to look for other problems. Do check this! Feel free to post your config.g, too, to see if there's any reason your motor settings on Z may be causing this. Are all your Z motors the same?

As you're running belted Z, the only other thing to check is that none of the pulleys are running eccentrically, which would cause Z banding.

Ian

Veti

i had a problem like this. for me it was ever so slight binding of the z axis. redid the z assembly until in ran without the slightest resistance without the lead screws, then added the lead screws.

Haggan90

@droftarts Hi!

I just checked this and I have the M584 before the motor settings
what do you mean by "eccentrically"?

Haggan90

@Veti YEs, I'm beginning to think this might be the problem here.. maybe my Z setup is to contraint.