There was already a hub like this posted somewhere, but it wasn't the same size as the original hub, and we needed the neck on the other side to help center the hub before drilling holes. This has a centering tool.The SCAD can be modified if you have fit problems. I suggest printing the test spline first and see if it fits on your motor before printing the whole thing. On Slic3r, use the new XY size compensation to correct fit.