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1.3 retro-fit information request

I’m looking for more info on the 1.3 retrofit kit.

The ball screws and rails are pretty well the only item I’m interested in as my kickstarter era boxzy has a slight wobble. Has the diameter changed for both these items? I’m having a hard time with the 900$ price tag of the kit. Can replacement screws be purchased separately?

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The diameter of the linear rails and ballscrews are still the same. Ballscrews typically are an exchange only item, except for the kit.

Most wobble is caused by damaged, or hanging, linear bearings, not the ballscrews. Many Kickstarter machines had great ballscrews on them. The quality control just wasn't as strict, so it was hit or miss. Some we're amazing, some weren't great. Most wobble issues attributed to the ballscrews was actually the machine being assembled in slightly the wrong order, which pinched and/or ovalized the outer lm12uu linear bearings, causing them to hang up on each cycle of the balls.

Before replacing the expensive stuff, I'd recommended a good greasing of the linear bearings and ballscews. Then loosen the set screw on the outer bearing mount, the one that holds the rail, not the bearing itself (though that could be too tight, so inspect it). Then loosen the set screws on the outside of the body that hold the rails in place. That will allow the system to relax, if it's been assembled under stress that's creating excess friction.

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OK i can check that out this weekend, based on the movement it dips subtly at a set interval as it travels along the X axis. I only really notice it while trying to face material with the cnc. What is the recommended grease?


This is the recommended stuff:

Otherwise, just plain old (non specialized) engine assembly lube works fine.


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