A friend had been wanting a Grenade. I had seen a few designs already, and really liked some, but wanted to add some additional functionality.

Not to completely reinvent the wheel, I incorporated a few of those designs and made the thing modular.

After many Boolean operations, and due to poor planning, I accidentally created a locking feature with a ridge on the opening of the grenade body.

I got griped at for taking this into a public place.. I really didn't consider that either..

I'm a bit paranoid about overhangs and bridges, so I actually rotated the top 180 before printing.

Just added the file top_tall_safe_fixed It has been rotated and scaled properly. The prior version was under size by a factor of 10...

The body needs no modification before printing.

One of http://www.thingiverse.com/thing:10718 will need to be printed and attached using a ~4x10+ screw. There are additional instructions for spring loading and a pin for that thing... It will also have the aperture logo on the back, which may or may not be desirable (one reason for modularity...)