This marker is placed onto anything that is currently On-Fire/Burning.
I designed it for use in Gaslands, but it should work for any game that needs visual fire indication.
There are multiple variants of the marker in the files - some complete, some in pieces, some drilled for inserting magnets, etc.
Can be scaled up/down as needed.
More of my stuff on my Google collections page - Adventures in 3D Printing
Somthing this small obviously looks better when printed at a higher resolution, but it will depend on your individual printer.