I've fed in new filament after an old one has ran out on the fly several times. All I did was firmly press the new filament against the old one as it entered into the feeder. It's a bit boring since you have to sit there and baby it for a few minutes but it's doable (small price to pay on a 30 hour print). So in your case I'd just cut the filament, remove the blob and then do what I described above.
edit: I should mention this was on the UM1, I haven't tried it yet on the UM2.
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gr5 2,224
I would shave that down with a razor blade.
UM1 can pause print. I'm not sure if UM2 can but I've been able to continue a long print after it failed. It's tricky - let me know if you want all the details - I have an explanation written up somewhere...
So in summary - if you have a UM2, try to stop it in a recognizable spot - memorize where the print head is, and then just cut power and quickly push print head off to the side before it leaves a big blob on your print. Then you can take your time (maybe hours?) and continue the print at your leisure. However you should keep the bed hot the whole time. If the bed cools to much your print might just pop off.
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