Art4BearingRing mod for 5.98mm ball bearings #99
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This PR contains my modified STEP and STL files for the Art4BearingRing, which slighly reduces the diameter of the torus to 5.96mm. The "6mm" ball bearings I got from the AliExpress link in the BOM on the website from are actually ~5.98mm in diameter.
The smaller diameter seems to cause considerable play in the Articulation 4 bearing ring, which is enough to make the stepper motor skip as the transmission column gear can jump. The guy in the YouTube video from the Assembly page of the website also mentions the same issue at the end of the video for this part of the build - so instead of finding different balls I thought I'd try tweaking the 3D model.
I tested a few different diameters, both smaller and larger, and found that 5.96mm works well without needing to modify the existing Art4TransmissionColumn as well.