• Print the base with support and raft.
• I used Das Filament PETG, works fine.
• I printed mine with 4 shells for sturdiness.
You will need 2 new allen screws M4x10 for mounting to the printer case, also 1 allen M3x6 for the bearing on the arm. The long screw holding the arm can be used from the original.
3 allen M4x8 screws for mounting the stepper motor to the base are optional, the original ones should fit also.
See robin7331's instruction video for final assembly: