Required part: 

• 608ZZ bearings or any 608 bearing
• M8 screw nut

Bearing dimensions: 8 * 22 * 7mm
Dimensions of the spinner: I designed the bearing location to be 21.8 mm. This will hold the bearings properly, but will not break them.
Dimensions of the knob: I designed the knob pin to 8.25 mm. 

Bearing preparation

The bearings I bought needed preparation because they didn’t really spin from the grease.

1. Check that the selected bearing rotates, is not clogged, broken bearing balls, etc.
2. Soak in alcohol such as isopropyl. for a few hours.
3. Remove from alcohol, clean or blow out with a high pressure compressor.
4. Pour a little instrument oil on it, turn it a few times and wipe it off.

Assembly

1. Of course, print out the modell. = D
2. I used a press to insert the bearings, but it can also be used with a rubber hammer, a smooth, strong flat table, or a vise.

Comment

• I made it from Petg, but there was a pla that broke several times with the same settings as the others. It happened with one of the 6 types of pla.
• I tested the model with a high pressure compressor and several random drops, and it worked properly.

Print Settings

• Material: Petg
• Nozzle: 0.4mm
• Layerheight: 0.2mm
• Supports:  Spinner: None / Knob: Build plate only