This are party I designed for my modified version of the Pusa I3 Hephestos. Mine has a full 5mm Aluminium ground plane, so I had to design mounts for the Y axis.

Printed in PLA with 50% infill.
The rod table mount needs to be printed 4 times.

Print 4x the rod table mount.
Holes fit M3 Screws, but can be drilled to any bigger size if needed.
Make sure that you have no tension on the rods for the bed, otherwise it effects the prints negatively.
The tensioner for the belt is the original one.