Nerf High Speed Automatic Dart Pusher Mechanism

thingiverse

This is a dart pusher mechanism for a full auto Nerf blaster. It has a lower gear ratio than the stock pusher mechanism, resulting in a higher rate of fire. This is a modified version of a previous design created by blasterforgePH. It has been modified to improve reliability and reduce the risk of parts breaking. Print Settings Printer Brand: Printrbot Printer: Printrbot Simple Metal Rafts: No Supports: Yes Resolution: 0.4mm Notes: The internal parts were printed at 100% infill, the case was printed at 15% infill. It is recommended to print the gears and pusher arm out of something stronger than PLA to improve durability. I used nylon for Gear A and the pusher arm. Gear B is the only part that should require supports. Other parts required: -1 #6-32 screw -4 #2-56 screws -1 pinion gear from a Blade 180 or Xtreme Pro 180 motor -A small amount of epoxy -2 screws to mount the motor. I believe these are M2x4mm flat countersunk screws -hot glue -threadlocker or nail polish A #6-32 screw is required to hold the main gear in place. This screw must be glued in place, as otherwise the gear will turn the screw and tighten or loosen it to the point that the mechanism will not work. Mounting screws are required for attaching the motor. 4 screws the same size as the ones found in a Nerf blaster are required to hold the 2 halves of the case together. #2-56 screws should work. Additionally, the new version of Gear A is designed to have a metal pinion gear, the kind from a Blade 180 or Xtreme Pro 180 motor, epoxied to the inside of it. This is to fix an issue where the gear would start to slip off the motor axle and be ruined. This was seen when using PLA to print the parts. The metal gear should be fixed to the motor axle using threadlocker or nail polish. Post-Printing Demonstration The above video shows a blaster firing 12 darts using this mechanism. It is using Xtreme Pro 180 motors. Note that this pusher mechanism required motors with a lot of torque for the pusher motor and flywheel motors, such as Xtreme Pro 180 motors. Compatible Blasters (So far) Rayven This is the blaster in the demonstration video. The pusher box will work in the Rayven with holes cut in the shell. Stryfe This is a test fit of the mechanism without the motor. It has since been successfully used in a Stryfe. Possible future updates -External box to hold motor in place -new version of Gear B to use a screw in place of the 3D printed nub on top of the gear to move the pusher arm