Summary

X stabilizer with adjustable length and angle to match your setup.
All you need to do is roughly position it where it needs to go and attach it to the ROBO3D case via screws or double sided tape.

Instructions

Designed to fit screw 6mm across and 6 point nut 12.5mm across from point to point 5.6mm high.
No support print needed. Print at standard quality 0.3mm layer height with 3 shell perimeters with 10-20% infill or solid, what ever works for you.

Print both parts.
Assemble them loosely with the screw and nut holding 2 pieces together.
Place the assembly inside the case against the wall and fit adjustable piece on to smooth. (leave it put on the rod no more then 5mm down to not limit the Z axis print area)
With that, mark where you need to attach the base on to the case.
Attach the base to the case using screws or double sided tape.
IF you use screws, holes designed to allow Up/Down adjustment but you will need to drill holes in the case as i have.

ROBO 3D X-Axis Stabilizer Adjustable and Removable