Spare part for designed for Marshall's Adventure city fire truck, but probably will work for other Marshalls truck as well. Some of Chase's trucks has similar devices so i included one for them too.
I have printed it split in a half using blue Prusament PETG and then I glued both halves together with CA glue.
For those who want a more refined bomb part, I have included fusion file to tinker with.
The author marked this model as their own original creation.