Noticed the z-axis sliding rod began to develop some play after several hours of printing.
I made this to alleviate the problem.
Together with the upper z-axis brace
they firmed up the z-axis nicely.
Part is symmetrical, so will fit both sides.
You will need eight m3 x 10mm cap or button head screws and washers to fix the part onto the z-axis stepper motor.
The uploaded part had been slightly revised with the edges of the brace filleted.