I needed a bearing on which to mount a large tool holder and this slew bearing was exactly what I needed.
Everything was printed in eSun PLA+ using Slic3r with 0.1mm detail and 20% fill and printed on a Prusa i3 Mk2S.
I used 0.1mm detail because I aim to get a good quality finish on all my 3D prints and the slew bearing needs a good finish to work smoothly.
The slew bearing outer race took 10.75 hrs to print, the inner top and bottom races took 4.75 hrs each and the 48 rollers took 8.5 hrs to print (as a single print of 48).
You can find the precision tool holder on Thingiverse (thingiverse.com/thing:230543).
For this project, I enlarged the bearing outer diameter to 170mm simply by scaling up the outer and inner races and the rollers by 116.5% on Slic3r. This also conveniently meant that 4mm machine screws self-tapped into the holes to join the inner top and bottom races.