Servo controlled Silly-String Trigger

thingiverse

The initial goal was to learn FreeCAD modeling; thus, a project emerged. The attached FreeCAD file and .stl models are available. This creation could be incorporated into a Halloween costume. The main bracket works like a clip-on spray paint trigger, suitable for various rattle cans. However, the servo bracket was designed for a specific hobby servo, so modifications might be required for other servos. A paperclip connects the servo horn to the trigger's end. Witness this design in action: http://www.youtube.com/watch?v=fPpnoXX5sNc. Interestingly, it is utilized in the Icarus One spray paint drone by artist/vandal KATSU. To assemble, print all three parts and attach the bracket to a can of silly-string using a 3mm screw. Position the trigger with its middle bulge on the nozzle, and tap trigger holes to 4mm. Mount the servo onto the bracket with the servoplate in between, secured by four 4mm screws. For added rigidity, attach the other end of the servo to the plate using screws and nuts. Control the servo with an Arduino or similar proto board.