This uses a common 806 bearing and I designed it for my MK3S using a 0.6 nozzle so your fit may vary if you are using a different size, the bearing capture is printed separately and glued into the bottom of the bed where there is a small inset (no support needed). The bearing will be a very snug fit but can be pressed in by hand. The base has a matching pin to sit inside the bearing snug again but easy to take off.
The bed is 150mm diameter and when assembled it turns very easy (will spin for awhile with a little effort).
The author remixed this model.
built in standoffs, different size. Basically I saw this one and liked the idea so designed my own after just looking at it.