NERF Scout IX3 triggering mechanism

thingiverse

Replacement for the internal triggering mechanism of NERF blaster Scout IX3. Over time, the back part of this piece within my blaster got worn out, and pulling the carriage would not arm the blaster anymore. Post-Printing The part were the blaster piston tooth slides (slide shaped) is on purpose slightly bigger than necessary, as you will want to sand down it with fine sandpaper to make it smooth and avoid friction. Also, you may need drilling slightly larger the holes where the metal pivot connecting to the rest of the triggering mechanism is fixed. To replace the part: remove the four screws on the slide, and gently pry open the two halves of the slide. Be sure not to lose any screw, nor other small pieces that will be there (couple of small springs and plastic bits, metal pivot) remove the rest of the screws, something like 10. Notice not all are equal, be sure to remember which one goes where. Then gently pry open the two halves of the blaster body remove the barrel, then all the trigger mechanism (one screw unlike all others, and couple of springs) remove from the trigger mechanism the piece to be replaced by pushing out the short metal pivot. Replace with the 3d printed one, mind the orientation reassemble in reverse order. When putting the barrel back, put some grease in the grooves on both sides (I used some generic GL2 lithium grease) to check if the repair was successful, before reassembling the slide you can load manually the main spring by pulling the barrel loading tooth with the shaft of a small screwdriver. If everything is fine, the blaster should arm and you can test that pulling the trigger correctly fires have fun shooting your friends with foam darts :-) How I Designed This This was my very first design, so I found it difficult to directly model the oval-like shape. Instead, I used the following trick: using a scanner, I made a scan of the original piece with an image editor (GIMP) I adjusted contrast and cleared out things a bit, saving the result to black and white using a tracing software (potrace) I converted the bitmap scan to a vector image using a vector image editor (inkscape) I made many small adjustments, removing glitches and smoothing things out using an inkscape plugin, I converted the vector image to the DXF file you find attached