This is NOT my design. Downloaded the STEP file from GrabCAD here:
From there I simply converted the STEP file to STL and printed it. Used supports and printed the wheel face-up as you'd expect. Printed actually REALLY nicely for my machine. This was in moderate quality, and I'm still very pleased with it.
Printed at max size for my machine it ended up around 125mm diameter face. With supports it used a healthy 200-grams of material. Removing the supports was easy (sorry that I forgot to take photos before removing the support structure). Sliced with Cura v18 from Lulzbot's web site.