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Cheers, I'm just trying to design up an all-in one version that re-uses some parts, since I think my Z-axis trapped nuts are finally wearing out after many months of use, and the assembly of the remaining bits of Sells' x-axis are quite awkward to dis-assemble and re-assemble.
I do like how he used parallel 624's on one side of each axis to prevent binding from imperfectly fitting smooth rods, but if I build another CNC machine I think I'll keep that part and use linear bearings or bushings on the 3-bearing side.