this print will require supports and a raft for best results.

the 2 circles when finished should press fit together out of 4 prints i have had to glue 1 

the slower the better for this print depending on the accuracy of your machine.

a little cleanup and 2 standard 308 bearings gets you going

I made the pin so it would take a standard cotter pin 1.38 x 28. just a small pace of wire would hold it.