About this 3D model

An improved version of Zheng3's penny ballistafor SEEJ. http://www.thingiverse.com/thing:23464 http://zheng3.com/seej/ Improvements: 1. rail now holds knock in ensuring that it travels in a straight line 2. knock is a hair deeper allowing a penny to better rest in it horizontally 3. rail is slightly angled upward to get a slight flight angle TODO: improve locking pin design, possible using A modification of http://www.thingiverse.com/thing:45737 improve rail design to make more durable and printable