Warning: buzzkill talk
For all the talk of fire drones, I suspect the cost of a reliable fuel for the flamethrowers will be the real limiter. Simply mounting them on a drone is not going to do the trick.
As for 3D-printing a flamethrower for your drone, the other buzzkill is how the fuel used can dissolve plastics. Sure, some fool may try it, but the results will be disappointing and underwhelming. Oh, and don’t underestimate how heavy the fuel will be, as it appears to make up a good chunk of the weight when fully tanked.
As fun as it is to speculate, I do think the main use will be “something otherwise inaccessible needs to be incinerated” like mylar balloons caught in power lines, things like that.
