I just set up a brand new Ten-High laser with a Ruida 644xs controller and I keep having this issue where the bi directional passes don’t line up with each other. It’s ok at low speeds but gets increasingly worse with speed. The attached was run at 275mm/sec. I can correct somewhat with the LB machine settings, but do you know what the root cause would be and how to go about testing? 
Any mechanical play in the X axis can cause this, but that tends to be consistent across a range of speeds. If you have firing lag or belt stretch, it can do this, and the Scanning Offset Adjustment settings are used to fix it.
Alright I’ll check and follow the instructions. I hadn’t thought of putting 2 corrections in, but that makes sense. Thanks!
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