I need some help! I´m not a Engineering, not even beginer

Software / Firmware SKR Boards
62

I don’t have an A8, but I built a couple of Prusa i3 clones from scratch, and they could suffer from the same issue. Right now, the X and Y axes are not at a 90 degree angle to one another. I would look for a way to adjust the vertical frame on your machine so that the X and Y axes were perpendicular to each other. Probably by loosening, sliding, then tightening the screws that hold the vertical to the horizontal frame. Assuming the photo you provided is in the same orientation as the printer, I would try to move the right side toward the rear a little bit.

Marlin also supports a “skew correction” feature that allows you to take some measurements and build an adjustment into the firmware so that it can offset the direction in which your machine is off. You put the proper adjustments into the firmware and recompile, and from then on things should come out square.

As I said, my preference would be to correct the mechanical issue. If there’s no way to do that, or once you get that as close as you can and there’s still an unacceptable amount of error, then the firmware fix is the next best thing.

2 Likes
63

@ttraband

Thanks a lot!! I arrived to that point. I will dismantle it and a assemble back!

The firmware is far from my knowledge, so I will try to fix it the hardware and improve the stability, the last few weeks I was moving it a lot.

Thanks

64

On my printers, I made sure the rods that X and Y slide on were perpendicular to one another with a small square (that I had independently checked was a true 90 degrees). I measured the rods rather than the machine frame as the rods are what constrains the movement.

While you’re making mechanical adjustments, I’d also make sure that the Z axis is perpendicular to X. Lock/clamp the Y axis in place, and with Z down low press the square against the X rod. Lift the Z axis up and make sure bottom of the square is in the same place on the build plate when Z is at the top its travel. Check on both sides and then you should be in good shape.

1 Like