This is a simple conversion kit for the dbot. With this adapter and some screws you can upgrade your printer to mgn12h linear rails. By doing so there will be no wobble in the hotend.
Y-carriages seems fine without double rails.
I would recommend you use two rails on the x-axis(H-bar)
Bill of materials per linear rails
This means if you want rails on both top and bottom you need to multiply this by two.
Important! - You need to trim the H bar 5mm
4x m5x12 (two on front and two on back)
4x M5 washers
4x m3x8mm to fasten carriage to mgn12 carriage
4x m3 washers