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Hi igi79. Thanks for your report about the weakness in the idler. I'd like to inspect this problem further, because I've printed for more than 6 months without any problem with a PLA version of my extruder design.
Where did the bearing shaft exactly break? Did it snap off the base? Is the M5 screw for retaining the bearing long enough to reach the bottom? Did you use a M5 manual screw tap before inserting the screw? Would you mind posting an image as make for further investigation? Maybe I'll get some spare time to design an enforced version of the idler.
I'm looking forward hearing from you...