Instructables
Picture of DA OTF Hidden Blade
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This is the re-make of the hidden blase models from the Assassin's Creed video game. This version is a dual-action out-the-front model which means that it uses the same finger motion to alternate between spring-launching and spring-retracting the blade. The majority of the pieces were 3D printed with the only exceptions being those I had to re-make due to my own failure to properly design the files on the first go. It was a good experience though as this is the first time I have used 3D printing. I have some experience with the software side, but I have never been able to afford the actual printing myself.

There are two videos included to help explain the mechanism. I would suggest building this out of balsa wood before 3D printing so that you better understand where things might go wrong and can adjust for them yourself if needed. It is a cool mechanism and fun to build.

Step 1: Materials & Costs

Picture of Materials & Costs
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blade.PNG
mechanism slide.PNG
kicker.PNG
paddle.PNG
wheel holder.PNG
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The materials used are minimal since most of this was 3D printed. However, some of the pieces are easier to use common items for. These are listed below:
  • 2 Pins / needles / tiny nails
  • Rubber band
  • Balsa wood (any modelling wood will do)
  • X-acto blade
  • super-glue (I used JET modeling glue)
Since the files that had printed were not 100% perfectly designed, I had to modify them a little bit with the balsa wood. This is what the extra modelling wood is for.

The total cost for the above-mentioned materials is fairly cheap if you have the blade already. It was about $4 for the glue, $2 for the wood, and I found the rubber bands and pins sitting around my house. 

The 3D printing was done through a friend of my family, so I cannot give an estimated cost using other vendors. Images of each of the CAD pieces is provided on this and other steps.
 
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Making a fully wooden one with only hand tools now. I've probably been looking for this type of design for well over a year. Thank you so much!

ok i tried downloading your CAD files but they are either locked or created with a newer version of cad. What year of CAD did you use and is there anyway you can convert them to 2007/2008 use?

Onyx Ibex (author)  lance.j.loveall2 months ago
I likely used autodesk 2013. I only have 2014 now and don't know how to save it as an older format if even possible. Maybe you can go to my autodesk 360 account and download it in a particles format there. You can find the link somewhere on my webpage. I am on vacation this week so won't be able to send a link or try saving differently. If you are still having trouble after trying this and after a few searches still have no luck, send me another message and I'll see what I can do. Good luck! Maybe someone else in the comments has an idea?
wezils tuts6 months ago

I have been looking for a da otf but the youtube videos just don't cut it

Onyx Ibex (author)  wezils tuts6 months ago

What part is causing the confusion? I can try to clarify better maybe.

wezils tuts6 months ago

I have been looking for a da otf but the youtube videos just don't cut it

sup3rb4dd6 months ago

is there any way i could buy the pieces from you? i dont have a 3d printer

Onyx Ibex (author)  sup3rb4dd6 months ago
I am not currently in a position to sell these. My plan was to be able to sell the parts to people who were interested but due to delays in my 3D printer arriving (still has not arrived) and my work load for this summer already there is no way I could guarantee a date when I can make these available. This disappoints me as well and I am sorry I can't offer the parts for sale. Best of luck though! It is definitely possible to craft the mechanism out of balsa wood fairly well. When I first started making this there were a couple of youtube videos I found very helpful, that would be a good place to start if my ible doesn't elucidate parts of the mechanism well enough.
Ok, thanks man.
pk1hunter8 months ago

Would you be willing to upload the cad file for this? I really want to make my own.

Onyx Ibex (author)  pk1hunter8 months ago

You can download the CAD files from my website. Be warned, they still need improvement though.

Jaraco0098 months ago
Name your price my man i will buy this
Onyx Ibex (author)  Jaraco0098 months ago

Unfortunately that is not an option yet. I still am awaiting my printer. I will of course post once it arrives!

plabarre9 months ago

Hey!

this is really cool
as i saw on your website you looked to have the models updated this month
i was wondering if that was still looking like a possibility or if i should edit them myself
Thanks!

Onyx Ibex (author)  plabarre9 months ago

Yet again, I must push back when I will be able to work on them. My printer and time both have been delayed. The earliest I will now be able to work on them is late March :( I will of course let everyone know when I begin working on them again, but at this point it is not possible. Best of luck!

ajdill4210 months ago
I WILL PAY MONEY FOR THIS
Onyx Ibex (author)  ajdill4210 months ago
When the design is finished I am open to discussion on this. It is finals week right now for me so I am short on time. But I expect to have plenty of time to perfect the design after the holidays. I will try to let everyone who is interested know, as well as provide a link for more info. It is encouraging to see the interest though! As I mentioned in previous comments, I am waiting for a 3D printer to arrive before continuing as well. That delivery has been delayed and I still don't know the exact date it should arrive. The last time I heard was early January delivery (it is killing me to wait!). I will let you know when I have more information...
King Don1 year ago
Pray tell, how much would it cost for me to order one of these from you, my good man?
Onyx Ibex (author)  King Don1 year ago
I am not in a position to sell these right now. I hope to in the future. I need to modify the CAD files first so that it works better and I need to wait until November for me 3D printer to arrive. After then we can talk if you remain interested.
hey
I'm willing to purchase this for around up to 40$ , its around november, can you please respond if you are still wanting to sell it please respond
Onyx Ibex (author)  Swordsdance0812 months ago
Seems reasonable, but what I meant was that I can't start working on them again until November. So I don't have anything available right now. I will let it be known when I get back into working on them!
are you ready now, dont mean to be mean
Onyx Ibex (author)  Swordsdance0811 months ago
I wish I could work on them. The printer has been delayed and I probably won't get it before January is the new estimate :( Trust me, I am much more anxious for this than you :) no offense. Sorry I can't offer anything else until then.
Onyx Ibex (author)  Onyx Ibex11 months ago
The original estimate would have made them available by now, but since it has been delayed, we all must wait longer.
bbrouwer212 months ago
Can you send me som more information about the material and dimensions from the hidden blade please:)
Onyx Ibex (author)  bbrouwer212 months ago
check out my website to see the dimensions on the CAD files. Materials is a mystery plastic that isn't PLA nor ABS. I wish I knew what it was. I thought PLA at first but it doesn't quite feel the same as normal PLA.
Guidomalan1 year ago
Does it retract?
Onyx Ibex (author)  Guidomalan1 year ago
Yep. The whole point is that it extends and retracts with the same mechanism
vvyom1 year ago
CAD files please.....
isaiah 991 year ago
cool
Nerp Derp1 year ago
I will even pay you. Please, I really need you. You are the best improviser i could find on this site. If you don't respond, I will be forced to find another. Please!
Nerp Derp1 year ago
This is not a scam please
Nerp Derp1 year ago
It will change the world and i need your craftsmanship to do it
Nerp Derp1 year ago
This will be a job i have hand picked you for
Nerp Derp1 year ago
LostRite text me at 703-483-0651 this message is only intended for LostRite and any others will be ignored
adivds11 year ago
can you give me the patern please?
umm i'd like to inform the creator and the viewers this is just like the mechanism of ammnra.. to the creator of this design, about the spinning wheel part, to better explain it(since you have trouble explaining it), give this link:
http://en.wikipedia.org/wiki/Scotch_yoke

how about the mechanism of ammnra's hidden short sword, cuz it like-..ages ago since trying to find out the mech.. if u have info 'bout it, message me 'kay?
it's cool conversing with ya bro..
Onyx Ibex (author)  Techie_Gary1 year ago
Thanks for the link. I couldn't recall what the actual name of that part of the mechanism is. And yes, ammnra has an awesome creation. Although I did not get this from his channel, it is pretty much the same.

As for the hidden short sword (which is awesome), I don't have a design for that. My original guess was that it was two internal DA mechanisms, one embedded into the other. My other guess was to keep the primary DA mechanism and then just use gravity for the second. The thinking there that maybe you would have the force from the DA up mechanism to fling the gravity part in too. I don't know :) It is very impressive and I love his work.
stik sam1 year ago
of course it is reasonable, but November is kinda long XD... how much would be the cost if you have to print it before you got your hands on your printer anyway?
stik sam1 year ago
love the design. I would love to try to build it myself but I do not have the right skills and the tools required (especially the 3D printer which is very uncommon around here). Is there any way I could ask for your help to help me build one? I could handle the details but I need help to build the mechanism.
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