You've returned to your unattended printer to find that it appears to have leaked filament and made a blob engulfing the hot end. This is called a "Blob of death" and is something that you need to fix yourself - it is not a warrantable or manufacturing issue.
Most commonly it is due to incorrect Z-offset, lack of calibration, or poor build plate adhesion - the bed height was not calibrated correctly or the build plate is dirty and not sticky enough, causing the filament to fail to stick the first layer down properly. The result is that the print can lift off the plate at any time - it can then stick to the hot end, and if left unattended, forms a big blob that sticks to the hot end.
Manually pre-heat the nozzle to 200 degrees and leave it for at least half an hour to see if that loosens it up a bit (Key word here is "Soften" - not "Molten"). Gently work at the blob to pry it away from the nozzle and hot end so as not to damage the wires. A heat gun may be needed if the blob does not soften enough. Once you soften the blob, pry it away.
For printer-specific help, search Google using <your printer model> blob of death removal
To avoid this happening, it is good practice to do the following:
- Clean the print surface before starting your prints.
- Use a gluestick or spray contact glue on your build plate to promote adhesion
- Calibrate the Z-offset - this option should appear in the slicer at the last step of the print dialog.
- Watch your print and make sure that the first layer is sticking properly to the entire print surface.
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