I upgraded to 10mm rails and a quick fit x carraige so i needed to save as much room as i could. i designed this Clamp style mechanical end stop holder to do that. the holes for the switch are 9mm On center and accept a M2.5 screw.. NOTE: these will not work with 8 mm rods they will never clamp on. print 2 drill out support material on little holes nut trap. Screw on limit switch with 2 m2.5 screws, clamp both ends on x rails with M3 screws. as a note i had to print with a brim to keep the ends from warping off the bed when printed with ABS, its not the best geometry to atempt to print with ABS but with a 3mm brim it worked fine.