Print and Cut - horizontal alignment problem

[richarji (Jim)]

I am working with Lightburn 1.4.05 and a Genmitsu LC-60A (grbl 1.1f). I have a growth chart that I am printing in 3 sections using the Print and Cut feature.

There is a problem with the horizontal alignment. It is repeatable. To troubleshoot the issue, I created a test file with some circles and rectangles and split the drawing using Cut shapes. The two files print perfectly, but the second file is shifted 2 mm to the left. Vertically it appears to be right on target.

I have gone over my LB configuration and my controller settings and can’t find anything wrong. I have checked my workflow against the documentation and the tutorials and believe that I am doing everything correctly.

I am in Absolute Coordinates. My targets are grouped. My alignment on the two target positions is certainly within a part millimeter. All movements are done through LB. I am at a loss as to what I should check or do to correct this. Can anyone offer any suggestions? Thank you.

[Vitticeps]

Are you doing the alignment with a red dot laser? If so, is it firing exactly where the laser fires?

[berainlb (PY)]

Can you upload the .lbrn files for review?

Also, there may be something wrong with the alignment targets.

Notice how the middle selection box is not centered to the intersection point of the two lines.

[richarji (Jim)]

It’s a diode laser to the red dot is the actual laser running at 0.5% power.

[richarji (Jim)]

Test.lbrn2 (6.9 KB)
Test1.lbrn2 (6.3 KB)
Test2.lbrn2 (6.2 KB)

These were created to test/debug the problem. I had the same issue on another file - which was the job that I actually wanted to complete, a growth chart, almost 1.5 m tall and printed in three sections. It exhibited the same behaviour. thanks.

[berainlb (PY)]

The issue is what I had postulated earlier. Your + alignment targets are not symmetrical.

To fix, ungroup the targets and recenter them.

[richarji (Jim)]

Thank you. I’ll try it in the morning.

[richarji (Jim)]

Thank you. I did as you suggested and recreated my targets. The problem went away and I had a perfect Print and Cut. I don’t think that’s a mistake that I’ll make a second time!