Hi, you're welcome 🙂 Yes that's a bit funny isn't it, the picture just wants to creep off the side. Ok, the machine must be calibrated ok, otherwise the outline trace wouldn't come out so nicely.
It _looks_ to me like slipping on the left-hand motor. Either overheating and dropping steps, the spool sliding around the motor shaft or the thread dropping off the spool. Things that make me thing that _isn't_ the problem is that the "slip" only happens at the end of each row, rather than half way through each row. Each row seems to be the correct length (in the top corner anyway). The motor might drop steps if it had insufficient power to pull the pen up to the top - but it drew the outline ok so that can't be the case every time.
You could disable the pen lift, so you might get an idea of what is happening during the "empty" return stroke.
What else is left... Catch it in the act? Draw again and watch it for the first couple of rows. If the pattern is repeated, it's a problem in the firmware or the setup. If it _doesn't_ jump in the same exact way, then it's a physical setup problem (spools or power or thread or something).
Physical problems might lead to the machine's ideas about where the pen is diverging from the physical location of the pen. If you did a "trace outline" again, after this drawing, and it does not match the initial trace, then you know it has diverged. You could watch the pink spot on the controller software too, during the drawing, that will tell you where the machine thinks the pen is.
sn
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Turned Norvegian
