How to Build a LEGO Disc Launcher: A fun brick contraption! - Frugal Fun For Boys and Girls
Sariel.pl » firing mechanism
Torvi - Ball shooting Lego machine | BuildIn3D
LEGO MOC Ball Counter by Philtech | Rebrickable - Build with LEGO
Activity: Let's build a ball shooter using LEGO NXT This activity assumes that the lesson 'What is a robot?' has already been covered. This activity takes. - ppt download