Uploaded a newer version with indents and the pointer raised above the top. It is slightly bigger than the smooth version so it slides on the pin easier. I used superglue to keep it in place but it doesn't really need it.
Printed the smooth version well at medium quality on Makerware with .2 mm layer hight. This file will print with no raft or supports. The medium quality allows sharpie marker to bleed through to the rest of the piece. Printing at high quality stops the bleeding.
It is very tight on the rod that is on the mixer. I had to tap mine a little bit to get it on all the way.
Printed well at high quality. No raft or supports needed.