Hallway Seej

by bLITzJoN, published

Hallway Seej by bLITzJoN Aug 14, 2016
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Hallway Seej by bLITzJoN is licensed under the Creative Commons - Attribution license.

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I had this idea for quite some time for my kids. I pulled together some various existing models to make "Hallway Seej".

Print Settings

Printer Brand:



Rostock MAX










I printed with 4 top, bottom & outer shells for durability. I used some gel super glue to make sure the catapults were solid. You can use pretty much anything for the catapult (not sure I would recommend PETG, though, that shatters more than breaks if compromised). I included the stopper at 165% scale that should be printed in flexible TPU or something soft if you can't print flexible filaments (nylon?) to reduce strain on the catapult arm.

For a tighter fit print the crossbar-165.stl at 106% scale (yeah, that would be 171% of the original).

How I Designed This

The catapult is 165% scale of the originals for the ammo of choice, Nerf Rival balls. The spire is 150% scale of the original.

You don't need a lot of rubber bands to be effective. We used two. The more tension, the greater the chance of breaking the catapult.

btw, foam golf balls do work, but gameplay is shorter.

Game Rules


Halve the quantity of ammo between both sides. Position each person at opposite ends of the hallway (recommend closing doors, etc.. to keep the firing contained) and arm with a catapult. The banner is set on top of the spire and to be positioned in front of each person (note: can be anywhere in front or to the side as long as each person is behind their spire).


3 ... 2 ... 1 ... FIRE!

Keep firing until a banner is knocked off the spire.

Alternate Gameplays

Put the spires in the middle of the hallway. Be careful, you knock your own banner off, you lose.

Don't like getting hit? Then put the spires at one end of the hallway and both fire from one end.

More than 2 player? Sure, print more catapults and have to take out each banner.

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How do you get the stopper to fit on the crossbar?

Ideally you'll want to print it in a flexible/semi-flexible material (i.e. TPU). If you can't then it would need to be installed prior to assembly of the catapult. If it's an after thought then heat the part up with a hair dryer or heat gun (get a hot pad mitt and protect those fingers!) and slip it on before it cools.

I don't think there is any way to install it before assembly. However, thanks for the advice! Purchased semiflex and it works beautifully!

Definitly recommend printing the crossbars at 106%. I printed the model at 50% of the original size and the crossbars at 53%. Don't use support when printing the side structure otherwise the arme holders will stick.

The balls are not printed I presume? What are they and what diameter do they have?

Nerf Rival ammo. They look like small foam golf balls.

Perfect, thanks!

I just printed the left and right brace, then a single crossbar and the crossbar is SUPER loose in the dovetail slots. Not sure that was intentional or not, but just FYI to anyone printing it, that's what I experienced. Needed to increase the width 106% to get it to fit without slop.
I used a Monoprice Maker Select (Wanhao Di3 v2 clone) and it prints a 20mm cube at (x/y/z) 20.01x19.99x20.01mm right now.

The original design is loose and perhaps made worse when I increased the size of the original by 165%. If you found the sweet spot for the cross members then I'll adjust and upload. I used some gel based super glue, series of rubber bands and left it to cure over night.

Yup, 106% was perfect! Just enough to have to apply a bit of pressure to get the cross bars in. The arm I left alone as it was just sitting in the pivots anyhow, they did fit a bit loose, but I didn't think it would matter. Not sure what I'm going to do about the bumper part yet, I can't print flexibles at the moment. Need to upgrade to the e3d Titan first I suppose.