Introduction: Oodassault 3.10

About: Just an aging K'nex launcher builder

Heyo, it's my first Instructable in a long time. My apologies, I only ever made iterative improvements so I never felt like a full set of instructions was justified, but now I've made enough changes I figured it was time.

I've also started a blog at which is where I'll be posting most of my activity from now on. However, I do like the Instructables editor, and I know plenty of you still check out things around here, so I plan on posting more instructions here in the near future.

Anyway, on to the parts list:


  • Green/Black: 86
  • White/Silver: 35
  • Blue: 1
  • Black/Clear: 1

Normal connectors:

  • Blue cap: 1
  • Tan lock: 8
  • Dark grey/purple: 16
  • Dark orange/brown: 11
  • Light grey/light orange: 4
  • Red/granite: 12
  • Green: 6
  • Blue 3D: 1
  • White/black snowflake: 4


  • Black hands/'Y's: 33 (some of these can be omitted if necessary)
  • Blue spacers: 3
  • Silver spacers: 4
  • Ball joint sockets: 2 (can be substituted with dark oranges/browns if necessary)
  • Outer hinge halves: 2

Step 1: Layer 1

Fairly simple to start out. This launcher uses a couple tricks to remain compact but fairly durable. One trick is to connect black hands to white rods in an unconventional manner to avoid using blue rods.

Step 2: Layer 2

The second little trick I use is an interlocking connection for the barrel/striker guide construction. This shouldn't be too difficult, but be careful while lining up all the rods.

Step 3: Layer 3

This is where most of the action happens, so there's a bit more to worry about here. Hopefully you can figure everything out fine.

Step 4: Layer 4

This is the same as the other inner layer, except it's easier to attach the pieces individually at this point instead all at once in a layer.

Step 5: Layer 5

Almost there. There are a few tricky bits in order to finish the outside layers. Once again, it's easier to attach each chunk individually.

Step 6: Other Little Bits

There are a few quirky bits we've yet to do. Let's keep pushing on.

Step 7: Magazine

While the launcher itself is nice and compact, the magazine is essentially what gives this launcher any worth. These last parts shouldn't be difficult.

Step 8: Bands and Clips

You can use whatever bands work best for you, this is just my setup. It's just important that the magazine tilt-locking band is stronger than the mag follower band with a full magazine so it doesn't try to hinge open from the force of the loaded magazine. It's also important to put the tilt-locking band in such a position that you can tilt and hold the magazine open without it spontaneously slamming back shut.

Sorry that I don't have pictures for loading and firing. I demonstrate that on the video on my blog if you want to look at that for help. Basically, you can push down on the mag follower until it locks into the bottom of the magazine and then tilt the magazine back until it snaps into position. Then you drop Oodammo (red/granite connectors with white/silver rods) in, rotate the magazine back, and unlock the follower.

The clips are not necessary. You can individually load the magazine if you want. Those of you familiar with my previous designs, I had quicker to use clips, but they weren't as durable and risked falling apart in your pocket. These are designed with war in mind, holding firmly together in storage. These hold 11 rounds. It may be easiest (ironically) to load the rounds individually into the magazine and then stick the yellow rods in the slots (loosely) and then carefully pulling the block out until you can put the locking bit in.

To charge the launcher, just pull the striker back until you hear/feel it set against the sear. The safety can be engaged by rotating the trigger guard so that the peg of the tan lock blocks the trigger. Then you can quickly push the half hinge piece to disengage the safety. Don't aim at anything/one you don't intend to hit, even with the safety engaged. Be responsible and have fun!