Instructables

DA OTF Hidden Blade

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.
 
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Step 1: Materials & Costs

Picture of Materials & Costs
case.PNG
blade.PNG
mechanism slide.PNG
kicker.PNG
paddle.PNG
wheel holder.PNG
wheel.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.

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

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

sup3rb4dd6 days ago

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

LostRite (author)  sup3rb4dd6 days 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.
pk1hunter2 months ago

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

LostRite (author)  pk1hunter2 months ago

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

Jaraco0092 months ago
Name your price my man i will buy this
LostRite (author)  Jaraco0092 months ago

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

plabarre2 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!

LostRite (author)  plabarre2 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!

ajdill424 months ago
I WILL PAY MONEY FOR THIS
LostRite (author)  ajdill424 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 Don9 months ago
Pray tell, how much would it cost for me to order one of these from you, my good man?
LostRite (author)  King Don8 months 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
LostRite (author)  Swordsdance085 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
LostRite (author)  Swordsdance084 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.
LostRite (author)  LostRite4 months ago
The original estimate would have made them available by now, but since it has been delayed, we all must wait longer.
bbrouwer25 months ago
Can you send me som more information about the material and dimensions from the hidden blade please:)
LostRite (author)  bbrouwer25 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.
Guidomalan8 months ago
Does it retract?
LostRite (author)  Guidomalan8 months ago
Yep. The whole point is that it extends and retracts with the same mechanism
vvyom8 months ago
CAD files please.....
isaiah 998 months ago
cool
Nerp Derp10 months 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 Derp10 months ago
This is not a scam please
Nerp Derp10 months ago
It will change the world and i need your craftsmanship to do it
Nerp Derp10 months ago
This will be a job i have hand picked you for
Nerp Derp10 months ago
LostRite text me at 703-483-0651 this message is only intended for LostRite and any others will be ignored
adivds110 months ago
can you give me the patern please?
Techie_Gary11 months ago
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..
LostRite (author)  Techie_Gary11 months 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 sam11 months 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 sam12 months 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.
LostRite (author)  stik sam12 months ago
Yeah, I can help out. I am actually very excited because I ordered my first 3D printer. I won't get it until November unfortunately. If you can wait until November, I can print this really cheap for you and just mail it to you at cost. Let me know if this sounds reasonable.
chris1525212 months ago
Nice! A couple years ago after playing Assassins Creed I tried designing something to do exactly this, but gave up. Your design is simple and efficient. I love it!
very interesting, i like the mechanism you used. but is it difficult to replace the rubber bands if they no longer perform
LostRite (author)  michaelgohjs1 year ago
In the final version I made, the rubber bands are all at the top of the blade, so they can be replaced without removing any other pieces. While I have not encountered their failure yet, it is a good concern over time.
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