Any sugestions how to build my gantry

[masinecc]

If i still use the RHS 200x80x4 and mount the linear rails one on the top and one on the bottom the center distance will be 260mm, so should be fine.How about the outer face distance between the linear rails blocks? Is 220mm enough?

[Boyan Silyavski]

If X axis is what moves Z left right -yes. On long Y axis - the gantry legs min 250mm, i would say at least 300mm step is right. I see you plan to use 3 bearings there which is even better. When 3 bearings are used they have to be precisely mounted otherwise it could get worse