What happend?

Hevilp

Today I started a long print. I left my home and went to work.
The first layers seems to be good but now I got this:

What the hell happend?

Samuel Pinches

Looks like the print came off the bed, and then the print stuck to the nozzle. As more filament was extruded, it formed a ball around the hotend. 

Looks like you might want to clean the bed with alcohol (ethanol), and try the print again. If you heat up the nozzle for a few minutes, the ball should be easy to remove from the hotend.

Either that or ....

Hevilp

The clean with ethanol does what? 
And why the print came off ? I should use raft?

Samuel Pinches

Ethanol removes oils and fingerprints from the glass.

A raft may help.