Rebuilding terribly engineered laser cutter

[threedee]

I'm sure they are. My problem with them is i cannot be sure of their specs. Model/serial numbers do not exist on "Smooth" manufacturer website. Nor anywhere on t'intertubes for that matter, aside from what I'VE posted...

Drivers came preset to 0.5A which suggests weak motors. Looked about the net for replacements, seeing nema17 sized motors up to 2A, 1A being more or less norm. So why 0.5A on mine ?

Right side is completely unsupported. The only things holding in "in position" are one plastic wheel pulled by gravity and drive belt. I can lift the gantry off the "rail" by 5mm. Right side motion is effectively restrined only on the left rail. So yeah, racking. But not to the point of stalling. I'm getting oscillations in straight and curved cuts. Resonance wave. Changes angle from speed to speed, but always present.