Hi! my name is Aaed Musa and I am 16 years old and I am an aspiring engineer. This is my own Nerf Rival assist that I designed, 3d printed, built and programmed. The nerf rival assist is an automated nerf gauntlet and turret the shoots nerf rival bullets with the press of a button. What makes this special is that it can be controlled from far away because it uses an IR sensor. The Nerf rival assist has proven to be able to shoot long distances, shoot at top speeds, and shoot with accuracy.

Here is the 3d Model of the nerf Rival assist in tinkercad

Here are some videos showing this in action as well as some tests

This contraption utilizes the following 3 unique mechanisms.

The magwell

• The magwell allows the magazine to be pushed in to unload the bullets. This was done by designing a Magazine well that can push on the lever of the magazine when it is loaded.

The loader

• The loader moves the bullets to the flywheel. It utilizes a gear to push the bullets forward. The loader is effective because it allows one bullet at a time to be shot while restraining the others. It can also release multiple bullets to be shot at a time. The loader is also designed to not jam the bullets and have smooth contact.

The flywheel

• The flywheel uses 2 12v DC motors to spin in opposite directions to shoot the bullet. When the bullet is pushed through by the loader it is then spun very fast by the flywheel and is launched forward. The flywheel is the most important mechanism and the heart of the Nerf rival assist.

I utilized both functions of tinkercad to create this. I used the design tools to make the model of the rival assist and export it to be 3D printed on my CR-10 3D printer. I also used the circuits tool to create a schematic and write the code for the gauntlet which allows it to have its unique abilities. The Nerf rival assist features the following.

LCD display

• The LCD display shows the battery percent of the 11.7v lipo battery as wells as if the magazine Is fully pushed in.

Lipo battery

• The Rival assist includes a 11.7 volt lipo battery that can be rechanged without fully taking it out.

 End stop

• There is a mini endstop switch that detects if the magazine is in or else it won’t shoot. This is located next to the magwell. The magazine has an attachment that allows it to push the endstop when fully in.

 IR remote and receiver

• The Nerf rival assist features a IR remote and IR receiver that allow it to work from far distances as long as you have the remote. The power button on the remote spins the flywheel while every button except 2-9 shoots 1 bullet by activating the loader. The 2-9 buttons shoot that number of bullets rapidly. So, pressing 5 would shoot 5 bullets continuously.

here is the schematic and code I made in tinkercad

Nerf assist parts list

2x Uxcell Shaft Coupling 2.3mm to 3mm Bore L26xD10 Robot Motor Wheel Rigid Coupler Connector: Each - $6.79  Total - $13.58

1x Momentary Hinge Metal Roller Lever Micro Switch: Total - $2.50
1x LiPo Charger 2S-3S Balance Battery Charger 7.4-11.1V: Total - $14.99
1x Male Female Bullet Connectors Power Plugs: Total - $1.25
1x 7 Round Cartridge Magazine Replacement Bullet Clip for Nerf Rival Zeus Apollo XV-700 / XVIII-700 Blasters BB035: Total - $9.00
1x Arduino nano: Total - $9.00

Solder: Total - $2.00

22awg wire: Total - $8.00

2x L298N Motor Drive Controller Board Module: Total - $9.00
⅛ inch heat shrink tubing: Total - $2.00

½ inch heat shrink tubing: Total - $0.50

1x 11.1v Lipo battery: Total - $16.00

1x IR receiver and remote: Total - $10.00

1x 1602 LCD: Total - $6.00

13x M3 x 14mm hex screws: Total- $1.50

13x M3 3mm Female Thread Hex Metal Nut Fastener: Total - $1.50
2x M3 x 50mm hex screws: Total - $0.50

1x Mini Gear motor: Total - $10.69

2x 27mm dc motor: Total - $12.00

2mm black foam: Total - $2.00

1x 10k potentiometer: Total - $1.60

1x 100k ohm resistor: Total - $0.06

1x 10k ohm resistor: Total - $0.06

1x electronic switch: Total - $0.50

7x ammo: Total - $1.00

1x wrist brace: Total - $10.00

8x 5x5x3mm magnets: Total - $1.44

Filament

Blue filament: Total - $16.18

Black filament: Total - $0.71

Grey filament: Total - $0.07

White filament: Total - $5.53

Orange filament: Total - $0.22

Total fillament cost - $22.5

Parts  price - $169.62