Laser engraver- tradictional GT2 belt

grabcad

After trying to convert the GT2 into a gear rack for my laser engraver, I found out the this idea has flaw that come with the straight teeth on the timing belt and pulley. The straight teeth are not smooth and have gap when transiting from one tooth to the other, this creates a period when the axis move faster or slower which in turn makes the laser burns a bit more or less and create some lines in the final images.This converting timing belt into gear rack solution only works if using helical tooth belt and corresponding pulley. The alternative is to use 2 stepper motor with 2 pulley on the same gear rack. The distance of the pulley should be a not round multiple of the pitch. For example in the case of the GT2 belt, the pitch is 2mm, the distance should be ((a number+0.5)*2mm pitch = ) something like 41 or 43mm.I don't have the budget for this solution for the moment so I just go back to the traditional way to install the GT2 belt by wrapping the belt around the pulley. The final results are as expected, the engraving came out correctly with lines in any direction.