So last night right after initial power up and checking that everything is in working order i decided to see how hot my new heated bed could get, and never thought it through.

Glass doesn't mind high temperature, but glass does NOT enjoy temperature differential...

Turns out those little strips of glass around the edge of the bed was still cold by the time the centre of the bed had reached ±80°C and then BAM...

Self inflicted injuries are no cause for sympathy ;)