by TibuTangboo
Imperial grenade as seen in The Mandelorian Episode 8 where a storm trooper blows in the door. Based on a single screen shot in a dark scene so it's not totally accurate. I added detail to the top (and bottom since it's symmetric) because I wanted to. I suspect it's flat on the prop.
Updated 6/15/20: Redesigned the middle to hold a rectangular 4x6mm LED that actually exists rather than some arbitrary size. Also added tabs on the body and a separate ring to allow a slight offset as seen in the prop.
How I Designed This
One screenshot had a gloved hand that I used as reference for size. The rest is based on the only clear view (seen here) that I brightened to get measurements. Some guessing was involved in some shapes and in particular, the top/bottom and the sizing of the holes for the red lights around the middle. I made the LED holes fit an actual LED that can be bought for $0.55 each. I don't have access to a 3D printer, so I don't know how well this will print, but I've designed and printed a lot of other things, so I don't expect any issues.