This is my first attempt at scratch building a prop. I know it's not much but I couldn't find this anywhere on Thingiverse so I thought I'd make it. I present: Jayne Cobb's Grenades from the Firefly universe!! It's not perfect, I don't know how to bevel the light bar or round the twist handle to conform to the sides of the cylinder, but I figure it'll pass muster for cosplay. I haven't printed it yet as my printer is down but I did split it for print. Any feedback or critique is welcome.

UPDATE: Added a split version with pins for alignment. Also corrected the offset on the bottom part.