Laser cut ninja toy

by zachr, published

Laser cut ninja toy by zachr May 13, 2011

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Made this for my 7 year old brother. He wanted a "ninja star where the blades pop out". It has a really nice action. If you actually wanted to throw it, you might make it out of Delrin which is less brittle than acrylic.


I cut the parts out of .1" acrylic. I glued the "x" shaped handles onto the two large disks with a little acetone. I put two layers of packing tape on the small round spacer so that the blades had a little more clearance. The pins are pieces of 3/32 welding rod I had laying around. I just cut them to size and press fit them into the holes on the blades. I found that the laser tapers the holes a little, so it is easier to push the rod through starting from the wider side of the holes. Each blade has two pins, one protruding from each side of the blade (check out the images and video for more clarity). Everything is held together using a 3/4" 6-32 nut and bolt. You could lock-tight it, but I have mine just finger tight and it stays together. Check out the video of it working:
It makes a great desk gadget!

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Can I still make this even if Im not a Ninja?

No. I'm sorry. If you're not a ninja, you can't make one.

Dang I guess I will have to train then. Thanks :)

Dear Zachr,

thanks for the design made one of those for my 8 year old son,


Oh that's super cool. Hate to be that annoying entitled commenter, but if you have time to make a vid of the snap action I would love to see it.

Little confused... didn't the youtube video show the "snap action"?

I was probably the confused one, although I swear there was no video attached to this thing the other day. In any case, I just hit this over at Make: Online:

Really cool stuff. I actually have a friend with a water-jet cutter. If I succeed in getting a stainless steel version cut and working, I'll let you know...



The file looks incomplete, there are just holes where there should be circles, the outlines missing, correct?

I think it is just a problem with how thigaverse renders the DXF for the image. However, just in case, I uploaded a PDF version (which ironically, doesn't render at all). Let me know if it works for you.

I am SO making one of these . . . . At some point :).

Will probably have to convert it to metric bolts and pins though! Don't think I have any imperial stuff knocking about. 3mm tig rods is about all!