5A Fuse Blew up

Hello All,

The 5A fuse that is surrounded by the Power input, LCD pins and heater inputs blew up today when I was running a print on TAZ 5 dual extruder. The other 2 fuses seem to be fine.

This happened after a few hours of printing and calibrating. Any idea how this could have happened ?

I upgraded to the dual nozzle like 5 months back. It was running fine.

I look at it as surge currents at the start up are close to the limits of the rating and after a very random time cause failure of the part. A factor of manufacturing variances and environmental factors.

Or things just break sometimes for no real good reason.