Rebuilding terribly engineered laser cutter

[threedee]

35k Aud for a small laser, yikes.

But, yeah, there is absolutely nothing in there that justifies the price. Not even tech support.
What is laser cutter anyway... 1 tube, 2 power supplies, 1 controller, 2 motors, 2 motor drivers, some switches and wiring in a box. With what i know now i wouldnt have even entertained the idea of importing manufactured laser. Even if i didnt pay for it 35k, i would have built it for one third or half of money i paid... Bloody annoying... Got a nice case though :D

[Doddy]

This image says a lot...



It's unclear from some of the other pictures, but this one is particularly interesting as it would appear to show the distortion on spokes projecting radially from the spiral centre, and at a position where the Y axis velocity is tending to zero or accelerating from zero. Is this true of other images? (they are less clear).

Could this be related to torsional elasticity of the couplings/Ali extension bars on the Y-axis?, is it worth trying to drive the two belts separately with two steppers, and removing the length of Ali bar?

Just a random thought