I designed Y-end system for my printer(Kid Mendel) using by derivative of the threadless ball screw.
I did not test yet.
The dimensions would be changed after the testing.
I'm now printing the parts.
I hope the results would not bad.

Bill of Materials

LM8UU bearing -- 2 EA
608zz bearing -- 1 EA
623zz bearing -- 3EA

8mm Smooth rod : 300 mm -- 1 EA
8mm Smooth rod : 260 mm -- 1 EA

M3x10mm bolts -- 20 EA
M3x17mm bolts -- 4 EA
M3x23mm bolts -- 6 EA
M3x5mm dish-head -- 4 EA
M3 washer -- 13 EA
M3 nuts -- 30 EA