A nerf revolver I made in my spare time, you'll need:

Some lead wires

A wire cutter

A soldering iron

2 x 4.5v/6v dc motors

2 x 5mm (diameter) x 28 mm spring (or something similar)

1 x 9mm (diameter) x 15mm spring (or something similar)

1 x 4.5v/6v battery pack/power supply

Tape

Superglue

1 x toothpick

at least 6 x half length nerf darts

Assembly process:

Insert the dc motors into the motor holder

Press the holder into shell front

Friction fit the flywheel on top (so it blocks the motor holder from falling out)

Stick the shell slide onto the shell so that the front is flat with the end of the barrel (and i goes over the flywheels)

insert the bigger spring (9mm diameter spring) into the hole in the shell front

Glue the hinge into shell front

insert the other 2 springs so that it goes from the trigger into the holes in shell top

Tape (glue later when finalized) shell bottom to shell top so the trigger is contained 

Insert a tooth pick into the small hole on the side of shell top

Insert rotate into the big hole in shell top

insert bullet pusher from the back hole of shell front

insert trigger to pusher so that the hole in the center goes through the tooth pick and the hole at the end goes onto the exposed pole on the side of the bullet pusher

Friction fit trigger to rotate into the trigger and into slide on the side of shell front so that the end also goes into the rotating mechanism

Glue in rotate lock into the tiny holes so that it keeps the rotating mechanism in

Glue handle onto the back corner of the combined shell top and shell back

Glue the front half to the back half via the hinge

Insert a loaded cylinder into the revolver and close it

Shift the motor holder so that it just doesn't interfere with the rotating cylinder but still is able to shoot the darts after it has to pushed out of the cylinder and glue it into place

Wire 2 dc motors (you might need to solder the lead wires onto the motor) to your battery back/power supply

Notes:

I printed everything in 20% but you can choose any infill% you want

“trigger to rotate” might break along the print lines because of the load, you might need glue it together after it breaks, then it should work fine

Print "shell top so that the flat side is the face on the bed

Print “shell slide” vertically so the hook is stronger

Turn off supports when printing the hinge (it is print in place)

You might need grease/lubricant in the rotate mechanism for it to function more efficiently

for the dc motors you need something similar to this: (just needs to be this shape)

https://www.aliexpress.com/item/1005006265469306.html?spm=a2g0o.productlist.main.7.6ba2183bEs4U9t&algo_pvid=fcb9ddc8-dba3-483b-b853-6ecd31019ad3&algo_exp_id=fcb9ddc8-dba3-483b-b853-6ecd31019ad3-3&pdp_npi=4%40dis%21AUD%213.24%213.24%21%21%212.10%212.10%21%402103244817123987896407732ea734%2112000036529028234%21sea%21AU%213021776841%21&curPageLogUid=6Goppe7Xa4zf&utparam-url=scene%3Asearch%7Cquery_from%3A