MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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http://www.thingiverse.com/thing:2107869 I designed Ammo to be used for this. Super simple and comes with a few varieties, and they are fast to print.

Projectiles for Micro Catapult - 12mm