Y axis sloped (issue)

I’ve noticed that my machine cuts slightly deeper further back on the same toolpath. After some experimentation, I’ve found that it will cut 0.015 inches deeper only 4 inches further back on the y axis.

I do plan on eventually purchasing the aluminum waste board which might fix this issue. Does anyone have any ideas on how I can fix this in the time being?

I have checked the screws and feet, as well as tightened the belts, and the little holes on the motors. (which fixed a slipping issue, but not the slope) That said I will be double checking everything, but I’m sure there’s something I’m missing, if anyone has any ideas they would be very appreciated.

Check the Y-axis extrusions for being level.

Or, tram the wasteboard:

https://www.shapeoko.com/wiki/index.php/Calibration_and_Squaring_the_Machine#Tramming

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