This model fixes two problems for me – it keeps the power rods very straight when not used, and provides a place to hang the power rod hooks.

Print: The main part fits on the Mk3/Mk4/Core One buildplate if you rotate it just right, with plenty of room for the front brackets.  I recommend PETG, 3 walls, 25% gyroid infill.  Supports “everywhere” required.

Assembly: Four M3 heat inserts are installed into the rear part, then M3 screws (12mm?) attach the front brackets to hold everything in place.