Squeaky Balls !
I have a T3DP3D Kossel XL+ with Haydn rods and magnetic balls.
When printing slowly the Delrin cup and magnetic ball interfaces creak and squeak and groan.
Is it advisable or necessary to lubricate these ?
If so with what, graphite dust ?
On oil or grease might attract dust.
I've used a small wipe with lithium grease and have no problems with it.
I'll grease 'em up !
I used silicone grease on mine.