Quote Originally Posted by M250cnc View Post
That is very true and easier to accomplish when you have bearings with way wipers sliding on rails.

So unless you enclose all the running gear in bellows you will embed dust to the tracks/bearings that will give very stiff jerky movement.
One random idea I've had for such situations in a dry enviroment, would be a suitable air supply aimed to blow any dust of the rails either side of the bearings. For shavings/dust, a gentle air supply would be enough to blow any rubbish of the rails. Off course, there is the issue that you'd need a compressor to provide the air supply.