This is a single print semi-sphere with a hole in the side that you can either drive in a screw (to give it a little weight and won't roll away) or insert a dowel and cap it off (to make it a perfect sphere). Fits right into LukeTansell's one-print catapult as well as my snap-together catapult:

https://www.thingiverse.com/thing:1860072

The hole will fit a screw shaft that has a width of 5mm and length of 11.5mm.

If you found this useful, it would bring me great joy to see your work - so be sure to share. :)

Or, just buy me a coffee: 

https://www.buymeacoffee.com/Julius3E8

OR… better yet, please feel free to dump a bitcoin or two here:

1Py3TUeR8noBN2giHyFV1GfB6x3Kh2WEVv

... include a note to the effect of "Hi Julius3E8, thanks for the [insert name of thing]... my life has improved five-fold on account of it and please accept this paltry amount in gratitude".

You're welcome! (in advance) :D

Also, feel free to peruse my other submissions which are almost as varied as they are many:

https://www.printables.com/social/320993-julius3e8/models

http://www.thingiverse.com/Julius3E8/designs

Enjoy!

Oct 30th, 2016 update: Here's an alternative catapult that has a lever lifetime guarantee: https://www.thingiverse.com/thing:1860072

Nov 1st, 2016 update: Added a core (or dowel, if you will) in addition to a cap so you can super glue them all together to transform this piece of ammo into a complete sphere. I printed one in translucent and used a glow-in-the-dark core... looks cool.

Category: Mechanical Toys