Pencil Launcher

thingiverse

Pencil Blaster https://youtu.be/NQ93R2Apu_g For maximum safety, use only pencils with a soft eraser in front to prevent injury. Insert the sharp point into the launcher carefully. Similar to the rocket blaster found at http://www.thingiverse.com/thing:1948686 , two powerful rubber bands are used to propel the pencil forward. The launcher has three main parts: a tube, a moving cylinder, and a fixed part that is attached to the tube with three small screws. Insert the pencil point-forward into the hole of the fixed part, stretching the rubber bands as you push until the lock clicks in at the end of the tube. If the tube is not flat, this may not work properly. Sanding the tube will solve this problem. Find a safe landing area and point the launcher in that direction before pushing both lock pins simultaneously into the inside of the tube: It's launch time! Tip: To achieve strong and flexible springs, print the moving part with 100% infill. For the other parts, 20% infill is sufficient. For a shorter range or shorter pencils, simply cut off a piece of the tube.