.5 nozzle calibration cube

i looked for a calibration cube and every one i found, the walls were to small to slice for a .5 nozzle. So i ended up making my own, if you make a 3d model with .5 walls it still has issues slicing. the original model i posted had .6 walls i updated this to the smallest possible increase to allow slicing to attempt to minimize any discrepancy in wall thickness. i use and tested this model in cura 3.1.

3d model
wall thickness: .501mm
cube size: 20mm x 20mm x 20mm