The other day one of our best friends had knee surgery. I created this model so he can point out to all of us what bits he had replaced...
He's doing very well btw... and was really happy with the print.
Just print straight out... no support should be necessary (the kneecap is a bit less round than it should be to make it easier to print). So the entire thing is a bit of an "artistic interpretation", but close enough for it's purpose.
I disabled the floor layers in my print so you can see the honeycomb fill pattern from the bottom... shows people what's inside the print.. which they seem to like (and I certainly do).