This is the Bolt Action Blowgun, a 3D printed gun that lets you shoot multiple rounds with a magazine capacity of 4 rounds!
The only things you need are a PVC pipe with 20mm outer diameter and 17mm inner diameter, which will be the barrel, bolt and stock, a tiny piece of 1mm metal wire, a little pen spring, and a rubber band!
The rest of the gun is completely 3D printable!
The bolt has a guided travel, and it locks like a real gun, so rotating it is not only cool, it seals better the gun!
Also, if the rubber band you mount in the magazine is of the right size, the bolt will lock open with an empty mag
The design is easily customizable, so you can design flash suppressors, sights, grips, different magazines and so on!
---Gun Test---
https://www.youtube.com/watch?v=mZOLv2WZP-0&list=UUWTzCtNMrdBBOWKIJSTQsig
---Bolt assembly---
https://www.youtube.com/watch?v=CK8Wp7uklts&index=2&list=UUWTzCtNMrdBBOWKIJSTQsig
To make the bolt cut a hole close to the end like in the video then insert it in the gun with the pin in the hole (like in the video, where i have the finished bolt) and place it in the opened position, then mark it and cut it so that i'll stay flush with the magazine well when open.
--Print the bolt pin horizontally, so that it will have more strenght, so that it will handle some abuse--
When you finished the bolt close it and with some CA glue attach the barrel (careful to not glue the bolt) so that it stays in a tight fit with the bolt, you don't want much air to leak!
Then you can use some hot glue to fit the stock tube (lenght of your choice) and butt stock
The grip with the stock is attached to the gun using the two pins, creating a very snug fit.
Print the magazine vertically and insert "Mag (2)" from the top, insert the magazine into the gun to take the measurements then glue it to the magazine.
Once you've done it you can fit the follower inside the mag and place the rubber band to make it work.
Attach the mag bottom with a little bit of glue, in case the rubber band brakes overtime and you need to change it.
The magazine catch has a slot for the spring, if it's too long cut it, once you place it slide the metal wire and bend it on both ends so that it will fix the piece.
If the magazine stops on the catch when you are trying to insert it cut diagonally on the mag(2) piece to make it slide better under the catch.
You're done! You can now insert four rounds in the magazine and shoot working the bolt after each shot
