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Gantry Misalignment V-Core 500
I recently discovered my gantry was not running parallel to the frame. I checked the frame squareness and it's within 0.5mm on the diagonals and the sides are parallel. BUT my gantry was out of alignment by more than 5mm when measured between the gantry ends and the frame. So I realigned the gantry to less then 1mm of misalignment from one end to the other against the frame, tightened the gantry screws and re-tensioned the belts. Now after a couple of prints the gantry is 5mm out of square again!!! The only thing that makes sense to me is that I am using a different brand belt for the x and the y motors. Other than this, does anyone have any ideas on why this might be happening? 
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