Mini BB MACHINEGUN

DISCLAIMER: Before you download this model, check your local laws. THIS IS A TOY, its firing BB projectiles at very low speed, so it cannot hurt anyone, but it can be dangerous if you hit someone in the eye. Please keep yourself safe, wear protective goggles and dont let kids play with it.

This is a miniature version of WW1 hand cranked machinegun aka "Maxim gun" that fires 4.5mm BB's (im not sure how much is 4,5mm in freedom units, but its pretty much standard BB's i used). Its fairly simple to print and assemble. Its hand cranked and it can fire as fast as you can turn the handle. Im using 4,5mm metal BB's which are being held in the chamber with a small magnet, but im sure you can also use plastic BB's. It can be printed on smallest 3D printing beds (150x150mm)

From additional stuff you will need:
10x10x5mm neodimyum magnet, if you use metal BB's (but you can use other sizes of magnet as well) and rubber bands (i used small silicone rubber bands, you can use whatever rubber bands you have). Check pictures for more info.

When you turn the crank handle, you are activating small needle inside of the mechanism. Needle is being held by a rubber band and by one tooth of the wheel. Once that tooth slips in the mechanism, rubber band pulls the needle toward the BB, it slams onto it and fires it trough the barrel. Then needle goes back, loads another BB into the chamber and process continue. BB which is in position for firing is being held by neodimyum magnet in place, to not simply roll down the barrel. You can use Plastic BB's but then, there is a chance that they can roll down the barrel. If you use plastic BB's you dont need neodimyum magnet at all

Everything is printed flat, no support. After print you glue parts together with super glue. I printed main body with ironing option, because then all parts come out smooth and nice. I included exploded view of the machinegun so you can see how everything is assembled. For neodimyum magnet and rubber band positioning, check one of the pictures