As in multiple other Threads discribed, I have the Problem that my files Move Around
The Triangle scored line should alighn with the outer Perimeter.
https://imgur.com/a/3Sdnhci
I Adjusted the Accelleration Up\Down no change
I changed the max speed up\Down no change U_U
I’m slightly out of ideas right now
I get this message when trying to open the attached image:
{“data”:{“error”:“Imgur is temporarily over capacity. Please try again later.”},“success”:false,“status”:403}
Have you calibrated the Scanning Offset Adjustment for a variety of engraving speeds?
Doing so will crisp the edges and generally aligns them with the cut vectors, with the Initial Offset values fine-tuning the start point.
@berainlb
Imgur sometimes has some Capacity Problems, but if you try a few minutes later it should work normal
@ednisley I only do line-Cuts no engraving
It is just a really weak cut line with Perforate Mode enabled for the Scoring lines and then a normal Cut with more Power to cut out the Perimeter
For whatever reason I’m unable to connect at any point. Can you post the image directly on the forum?
Jup Done
Cutting the Paper I go with S200 P20, the Line Scoring S450 P12 with Perforation Mode enabled
That simplifies things: the machine has mechanical backlash. This often happens with custom builds, because the dopamine rush from “It works!” tends to suppress the hunt for any remaining calibration issues.
Source: Been there, done that. 
Most likely, there is a loose setscrew securing a belt drive pulley to the motor shaft, so that it can shift slightly during normal motions. It will jam clockwise for a while, jam counterclockwise for a while, and repeat intermittently.
You may also find slightly slack belts causing lost motion in both directions: the motor will turn, but the head doesn’t move until the slack tightens.
Finding the source (or sources!) of the problem requires careful inspection with attention to detail, but it’s in there somewhere.
XD
My Problem is, the Laser is Running smooth if I just run one Colour, but as soon as I use Multiple Layers I get weird Problems like this Layershifting.
I did a Backlash Cal a few days ago, but that was only 0.29x and 0.32y
Not those 1-2mm I am seeing right now.
But yes, the Belts indeed might be the Problem.
I’ll check for any loose Belts\Grubscrews
Thx for you hints this far 
If you were tweaking the acceleration by just a few percent, reduce it in Machine Settings by a factor of ten. Similarly, reduce the maximum speed for both axes by a factor of four (and the power, as well). Those will be too lethargic, but should quickly identify any overly optimistic values, after which you can retune for best results.
Soooo… I finally got some parts from China…
Put them in…
Same problems U_u
The problem is within a colour layer, not with the colour change, contrary to what I thought.
I tightened every screw, checked backlash, belt tension etc.
Everything is fine as far as I can see.
I have slowed down the acceleration by 10x.
Same deviation on both parts.
As I understand it, if the problem is in the acceleration, the distance should be different on slower acceleration.
The cut marked ‘L’ was the last and it has a gap of 17mm.
It should be 7 mm… But it is the same for both versions 1500 mm\s² and 150 mm\s².
Both are cut at 25 mm\s cutting speed. I don’t think going slower will make much difference.
At this point I’ve run out of ideas.
1500mm\s²
150mm\s²
If there’s anything marked L, it’s not obvious.
Given the changes in the hardware, the design, your description of the problem, and the complexity of the pictures, I have no idea what’s going on.
Let’s start over.
Can you provide:
Machine Settings values for the X and Y axesThen, perhaps, we can make better recommendations.
Thanks …
Sure.
Lightburn file is a bit to big… so I add a link Wormhole - Simple, private file sharing
Cut overview\Detailed Photo and Machine Settings are attached
The Intersection of those two red lines should be ‘L’
But as you can see it is about 10mm of in the Y direction
The Closeup is roughly the red Square.
These are the Settings for the second Cut with 10x slower accelerations.
For the previouse cut I used X-Max Acc 3000mm\s², Y-Acc 50000mm\s²
Contrary to what I expected, LightBurn doesn’t go through the image in a consistent direction, but it does draw most of the patterns while traveling along the X axis.
What’s significant:
Scrubbing through the Preview suggests the misalignments happen when the head moves to a new row and starts drawing a three-point shape.
Except for that one screw you can’t see, let alone reach, in the Y axis drive train.
I think there’s a pulley or coupler secured to a shaft with a setscrew resting on a flat, but the setscrew is slightly loose and allows the flat to jam in one of two fixed positions. It will feel tight when it’s jammed, but the force required to move the heavy gantry is enough to dislodge the screw from the flat and rotate the shaft to the other position.
A previous thread with pictures of what to inspect inside the cabinet:
At this point, I’d loosen every setscrew, one at a time, along the way from the motor to the gantry (both left and right), then rotate the shaft / pulley / coupler back and forth while tightening that setscrew. That will let you feel the motion as the setscrew bites into the shaft, so it will end up nice and tight in the middle of the flat.
That you will find it essentially impossible to get enough hands and eyes into the places where you must tighten and wiggle goes without saying …
Again, its not the Pully System.
This time I used Blue Loctite and marked the Position of each Pully
They don’t move…
Same File, Same ‘Slow’ Settings Accel 150mm\s² and 25mm\s cutting Speed
Same 17mm (10mm off)
There has to be something different, accumulation of something.
Backlash?
If I Cut a Narrow section of the 600x600 File, thats just 150x600 the offset is still there but a fraction of the length if I cut the total sheet
How do I test\correct for any backlash propperly?
Because the setscrews bear on a flatted part of the shaft, they can be both tight (on one side of the flat) and allow exactly the motion you’re seeing when the shaft rotates to jam the screw against the other side of the flat. Loosening the screw and reseating it while ensuring it’s centered in the flat is the only way to properly secure it on the flat.
I trust you have also checked the flexible couplers and the pillow blocks anchors.
With all that done, however, I have nothing else to offer.
When you discover the source of the problem, please let us know, because it’ll help everyone else!
