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Your "X lasercut carriage" doesn't appear to match the piece on 393155 (xyplate-short.dxf).
I'm looking at this picture: https://www.flickr.com/photos/d-newman/14521954744/in/album-72157645313526624/
There is no picture of this piece on the Flickr site for your triple lead screw design so I really don't know what you used there.
Would you please advise?