Not the first 3D printed bearing on the internet… but maybe the first with a bearing cage? This is just a simple (random size) bearing I designed for testing the capabilities of my XL 5 tool head. You can print this with the MMU or AMS as well. I just used PLA for everything but the dissolveable support material, which was Polydissolve.

I used high perimeter count to make sure everything was 100% infill, and then just threw it in my ultrasonic cleaner with hot water and it came out pretty darn well.