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Replace bent rod on the Ultimaker 2 extended #399
The back cross shaft is bent and causing resistance in certain places. You can see this by pushing it forward and back when the machine is off. This is almost certainly causing the tolerance issue.
I'd recommend a full stripdown of all those poles to see if any others are bent before making an order. It probably happened when applying huge forces to get the filament to run through when it didn't want to go.