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Knurled bolt removal

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Which printer?  I don't know how to do it for the um2+ but for the UM2 it's pretty easy and obvious - just loosen the set screw on the side.  I think it's a 1.5mm hex.


Hi there

It is a Um2 extended

I loosened the grub screw and completely removed it, but for the life of me even with pliers I cannot remove the knurled bolt, I have tried shocking it and using penetrating spray.

Should it literally just pull off?

Thank you in advance

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Finally managed to remove it

Took the motor down to the garage, clamped up the bolt in a vice and used a punch and mallet.

I have no idea why it was stuck on there so tight.

Swapped it for a mk8 driver gear and so far am impressed with the results over the knurled bolt

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It was probably loc-tite from the threads. I've had a few of those that were impossible to remove without significant force. Heat would probably work as well but I was in a hurry.


Yeah it was a pain, had the same on my other Ultimaker 2 as well.

Also am using your low friction spool and uprated filament guide, great work :D

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