We're doing this first because it looks awesome, and if you get that far it'll make you want to complete the rest of the project.



Cut six 1" diameter PVC pipes to 19" in length.



Use 1/2" foam to cut out 6 foam supports (8 for a static barrel.) This file is for a laser cutter which makes the final part a little smaller so you might need to scale it slightly to work with whatever method you use.

- Print the file onto a sheet of paper, glue to foam, cut out with a knife.

- Same thing, as above, but use a band saw or jig saw.

- Laser cutter

- CNC machine

- Mind bullets (advanced users only)



Four of these only need to look pretty, two need to fit snugly in the end. On all of them, the pipes should fit snugly; our entire barrel assembly is held together with nothing but friction and paint. If you're cutting the holes manually it is also easier to hide mistakes if the holes are slightly smaller instead of too big.



Test fit all of your foam pieces, then add a layer or two of Mod Podge. I know this sucks and it takes forever to let every foam bit dry, but if you don't Mod Podge the foam it will melt when you paint it.



The wood pieces are smaller and have a center hole for the axle. If you aren't going to make the gun spin you can skip the wood pieces and make two extra foam supports. Our first revision of this gun didn't spin and the barrel was just held in place by the friction of the foam in the funnel bit and a single screw on the top.



Fit all of the foam pieces together as best as you can. To get the individual barrels even cut a scrap piece of 1" thick wood to fit inside the end so you can press the barrels down against it.



Bolt the wood bits onto a 12" long 3/8" wide threaded rod (our axle). As you can see in the pics, I only used hardware to secure the very end support and then used the second support as, uh, support. The hardware I used was

nut - lock washer - washer - fender washer - support - fender washer - washer - lock washer -nut



Once the wood supports are attached to the axle, slide the wood pieces onto the barrels. This is kind of hard, I ended up pressing down on the wood support and spinning each individual barrel up into the support a little bit at a time. When you're done you will probably have to readjust all the foam supports again.