When I started out with my machine I did have issues with motors stalling on the X-axis, but really that was just me trying to push it too much. Now I've been a bit more conservative (still 10m/min which is fast by most peoples standards) the machine hasn't stalled for several months so that's not an issue.

I'm going to be making a couple of rotating ballnut mounts soon, so let me know if you're interested and I'll work out the price as it'll be more efficient to make several at the same time. I've updated the design to be fully enclosed with aluminium such that no swarf can get in. Something like this, can of course modify it to suit / aid mounting:

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