The fire took place in the cooling tube coating oven on the third floor of the Gigafactory, although Tesla was still investigating the cause.

This is likely just a blip in Tesla's overall production. However, it's coming at a terrible time for Musk and crew. Tesla is scrambling to produce as many EVs as it can in a bid to boost its summer quarter sales numbers, and that means wringing every last drop of production capacity out of its factories. This is a company that dropped color options to speed up manufacturing -- it doesn't have much tolerance for setbacks, however temporary.