Saw a picture of motorcycle with a grenade locked to it brakedisc as a theft prevention so decided to make one for myself.

DO NOT print the Grenade.stl unless you really want to, print all other parts and then assemble them together, might to use some more force with putting "middle body" with "main body" if you won't be able to make it 'click by hands, just use a wall ;-) I did mine that way, but I've changed the dimensions a bit seeing how hard it is to combine them albeit I haven't printed another copy to see how it turned out.

With combining "igniter" with "top body" you might need to use some force as well.
If your printer isn't great at printing threads just gimme a shout I'll try to make an alteration of it.

Just don't get killed with this if you go in public.

UPDATE 6.07.19

I've updated Main Body.STL so if you print it upside down it won't need supports as all angles are 45 degrees or bigger, either inside or outside. As well I re-orientated all STL's so they're ready to slice right away without having to rotate them.