So to continue a print you have to edit the gcode. The first two (two!!! not one!) posts on this topic are excellent. The G92 is critical. You want to set the E value to whatever is the last E command that you delete such that the new E commands only move the extruder a little bit and so the UM2 doesn't try to extrude many meters of filament.
HOWEVER, there is a feature in Marlin that if you do an unreasonable extrude (I think it's over 1 meter?) it will be ignored so maybe you can skip the G92 step occasionally but I'd definitely do that step. That's why the first post doesn't mention G92 because he just got lucky. The E values actually reset every 10 meters or some such limit so it's possible that the E value will be less than the ignore value and then you have a disaster if you skip the G92 command.
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gr5 2,224
Yes but it may take you an hour or so. I guess if you really want to do that then make sure the heated bed stays hot because as soon as it cools down the part will pop off the bed.
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