Best printable 6004 ball bearing (print in place) / Kugellager / Fidget

After testing numerous existing printable ball bearings, here is my version, focussing on the following points.

• Large contact surface of the individual balls to prevent them from breaking off during printing.
• Bevelled edges to tolerate Z-offset deviations
• Optimised spacing (not one distance for everything, but depending on the risk of sticking), resulting in better print success, smooth running and short rolling-in time
• No tilting of the balls when spinning due to large-surface guidance
• Self-centring inner ring due to slightly convex ball bearings
• Guided balls
• Bridges printed as straight as possible
• ...

If the bearing does not rotate (use your fingers first before risking to destroy surfaces with knifes):

• Break the inner ring free. The inner ring must be able to rotate
• Break the outer ring free
• Break free each individual ball; it must be able to move and rotate. If it doesn't rotate push it like you wanted to press it through (from both sides) until you hear a little cracking.

You can press anywhere to break free, but avoid the thin connecting webs in the centre cage ring on the outside of the balls

Nevertheless, the ball bearing needs a well-adjusted printer and a perfect z-offset, print slowly and set the Z-seam to "Random". Be careful with brim, you will never get it out when printed inside your bearing.

The bearing will take some time to run smoothly.

Happy printing!

PS: I'm looking forward to seeing some Makes :)