Reinforced MMU2S Extruder Idler
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Reinforced MMU2S Extruder Idler

The shaft that comes with the idler gear is about 23mm too short see cover photo shaft is recessed the same amount ...

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Reinforced MMU2S Extruder Idler alternatives
MMU2S MK3S Extruder Idler with bolt
John Lafferty of Yellowbox Shed