Stiffen up the rails, or upgrade to something more hardy

I think the Z motor is fine. Where I notice a difference is the two Y motors vs. the single X. Y cuts way smoother with twice the power.

I would think about dropping a higher torque stepper on the X if the X Controller driver/PSU could handle it.

looking to order from you today !!

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please Inventibles upgrade your Z-axis.
something like this is a great improvement, C-Beam® XLarge Linear Actuator Bundle - OpenBuilds Part Store

I do not understand all this flex talk. I have not seen any evidence of this “flex”. I’ve had my xcarve for 2 years and it runs as good as the day I built it. This is a hobby machine and not a production machine. I would bet you probably push your machine too hard for what it is meant for. The xcarve cuts at 10x slower speed that a production model that cost 6 to 10 times as much.