Sometimes when I do a second pass things don't line up . I think the problems in the x axis because it seems to happen more when the laser head runs all the way across the material to complete a circle or something. But its not consistent and the amount its off varies. My belts seem to be tight enough . Sometimes when the x axis makes an abrupt change to one side or the other I hear a thump sound but I only hear that when it makes a quick change from left to right or vice versa. If I draw circle on the left side and one on the far right it just makes a smooth run across the board but its when it jumps back and forth I hear this thump I know I'm not explaining this right but if you have any ideas
Thanks