Can't get good graphs on VC4 400
This is 24th graph I did today. After 3 hours I still can't get the belts to align. It doesn't make any sense. When I loose the upper belt it doesn't get closer to the lower belt. Either the second smaller peak dissapears or nothing changes. I tried realigning Y rails, the X gantry. Measured distances between various points to check for obvious frame issues.

Solution
Getting there finally! I unbolted everything I could and tried to alignt and bolted again. This is the latest:
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