This simple bracket can help hold in place the top of the Z lead screw. This in turn might help with the stability of the cantilevered bed.
BOM:
MR 148 bearing
2x M3*8 screws
2x M3 nuts
Since every build is slightly different, the distance between the 1515 extrusion and the lead screw might be different. For me, it was 5.8mm.
If your Z stepper stalls near the top of the travel, you might need to adjust the depth of the bracket.
Keep in mind that technically it's not advised to constrain a lead screw on both sides. For this to be an acceptable solution, the tolerances need to be spot on.
The author marked this model as their own original creation.