CRE-004 Cryptic Pattern Leg Prosthesis

by crewolprint3d, published

CRE-004 Cryptic Pattern Leg Prosthesis by crewolprint3d Jan 12, 2018

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This is this is a 3D printer-based prosthesis design. Developed and designed by Agung Junianto, Industrial Product Design Department, ITS Surabaya, Indonesia. Advisor: Djoko Kuswanto, ST., M.Biotech.

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This is the single best use for 3D printing. You have made the world a better place ☺️

hello, i am an Student and i like to know if i can print this to present it in my class?

please, you can use as per your requirement

wow this design looks really slick. Just awsome!

I was curious if you could let us know where you found the non printed items so we could purchase them. I'm remaking this item for DISPLAY purposes only for now. However I want it 100% to your design

all components other than printed parts, are easy to find in the store of tools and building materials around your place. that's what we think about when developing this prototype.

I can find the parts I was just curious how long the pipe needed to be for this particular model. I'm using it for display at my shop (credit to you) so I wanted to have the correct sizes.

I've tried the pipe with a length of 300 mm

Are the solidworks files available so people can adjust the dimensions ?

im sorry, i dont have .sldprt file, but maybe if you want, i can share the iges/step file.

Without the design files, this is nearly worthless for real patients. Is this an advertisement?

please..you can visit my instagram..crewolprint3d

Hello I am actually contemplating surprising a special person with this as a functional prosthetic. I was hoping I could get an email or some information I could use to contact you and bug u with so I could work on make this pretty function for someone and give u some good feedback for others. Please let me know

Very nice ... I like things what helps people or are in any way useful.
Sadly 80% of all stuff on this site (like on other sites too) is trash. But this prosthesis is great!

This is probably the coolest thing i've seen on this site, and probably will be for the next 6 months. Great work!

Now all that need to be done is for someone to use a 3d scanner on the recipients stump for a perfect fit just a thought

That’s being done! Several of my contacts in the prosthetics world do that and I’m personally working on a scanner-printer hybrid design for making that process easier.

Antes mais nada parabéns pela atitude de colocar a prótese para download e aquisição dos usuários.. eu tenho interesse em ajudar o próximo e gostaria de fazer , doando as próteses e ajudando em acoes sociais e possível .. sem comercializar .. so ajudar mesmo

I am also a prosthetist and have been making prostheses for 30+ years. I love to 3D print items, just be careful of printing this for someone without taking the liability on yourself. I say that because the feet that are commercially printed are tested by the companies through at least 2 million cycles or steps to insure there is no failures of the feet. That may seem like a lot, but it is only about what a person walks in a year. Also the feet we buy from manufactures are rated for specific weight categories and their activities. So if you print this and give it to a person and in a month they fall when climbing steps and their hands are full or crossing a road and it snaps when they are in front of a car, this would be partially your responsibility. I have had components fail on my patients even with all of the testing done and it can be very devastating if they are doing an action that can cause problems if they fall and are not ready for it. The testing and the responsibility of making a foot is one of the reasons the foot itself can be expensive. There are over 200 types of feet now available for amputees in the USA. They range from firm feet to very flexible ones. Costs also range from $500 to over $100,000 for the foot alone depending on the foot. I know it seems like a lot, but think of now what goes into a prosthetic foot and what liabilities there are when you make one.

I think this is a great idea, but just use caution if and when you might make this for someone or for yourself.

thats a good point, i have a question what if a print the foot and make a mold and then casting in another material a rough one?

It depends on if you are molding the remaining foot or the residual limb (amputated limb). It is very hard to cast or scan either one and make a reverse duplicate of it. It is actually easy to scan the residual limb, but to make a socket that goes on the limb and is comfortable is very hard. There are soft spots on the limb and boney areas, and if the socket (what goes over the limb) is not proper it can cause ulcerations and infections that cause a lot of problems. If it is fitting well though, it can be something that allows them to walk without anyone knowing.

Wow, this is a great observation. I believe to mitigate the dangers some serious testing needs to be done to see for weak parts and combine that with CNC made metal parts or some other strong material like CF/Kevlar composites or nylon in its critical points. But how would you test its durability? Do you know how they test this 2 million cycles under what conditions (force applied, type of movement)?? It would be great if this could be replicated to test the model. I personally im planning on doing it since im also working with 3D printed prosthetics. Do you know of any international standard to which the design can be subjected to?

I think that testing with overweight and millions of cycles would reveal mechanical weak parts or places where wear resistan materials are needed in combination of stress resistant materials would make this work a great ground breaking base to start with 3D printed and CNC made lower limb prosthetics which are actually useful and affordable.

As you were interested, here's a couple of International standards which would help with validating the robustness of such a (commercial) device. If this is for home-made use, you bear the personal risk.

I have seen the testing machines, but do not know how to make them. The idea would be to put the pylon "pipe" into a clamp and then have it push down on heel and forefoot forces, rolling from heel to toe, the repeat. These are very robust machines and what I've seen have been made by the companies that make the feet. I believe there is also an international standard that has to be met. Most foot manufacturers not only sell their feet here in the US, but also internationally, which have certain standards. I am familiar with the College Park foot, the Truestep. This was started by an inventor who saw the movie Terminator and decided to create a foot for people to use with that design. He had gone through many different designs, using stainless steel, composites and a large varied about of materials. Since 1986 they have been making feet for amputees.

Here is the website for College Park, in fact there is a picture of one of the testing machines on the site.

Another thing is that when a person walks, they put between 2-4 times their body weight in forces through their leg. So if it just is for a 100b person the prosthesis needs to be able to take 400 lbs of normal forces going through it, just to be safe.

this is so very awesome! this is the type of things we wanted to see being made to improve quality of life for people, great job. my only suggestion is maybe to print some parts from semi flexible rubber type filament. it sounds soft but it really is not. it will bend a bit but after a few layers thick that almost stops and this stuff can never break ever! i tried to snap a strand just 1 by hand it is impossible for me. so many together well you get the idea. it will work great for this. hope you see for yourself as it should add some comfort aswell. thanks so much for sharing!!

Thank you for your sharing.

Amazing work! 3D printing just got a lot more exciting :)

How durable is this leg? What's the weight/height limit?

I assume you don't recommend printing with PLA?

Please post the Fusion 360 files of the joint cover and front and rear cover files. This will allow easy modification of the covers to fit individuals prosthesis. Thanks and great work.

hi incredible work !! for scaling what are your suggestions? thanks.

That's an awesome work! Can you recommend me somewhere I can learn more about this? I would like to be able to make one for someone who can't afford it, and I have no clue about how should I print it, as in scaling it or something.
Thank you.


Sign up autodesk academy for free and they have an interesting introduction course.

Thank you very much! I didn't know they had free courses.

Thank you for sharing. How did you print the covers? Best wishes.

Wow, thanks for sharing i'm surre this will be usable for some people!

Comments deleted.

What material/materials did you use? PLA? ABS? Very impressive design. I have been printing hands for Enable but leg/feet offer up a whole new way of helping!

thank you,
i use ABS for some of them, and PLA, but its really good if you can print them with HIPS.

IMHO ABS/PETG/HIPS/Nylon shall be used since such plastic is hit resistant. PLA is brittle for this purpose (for expositions only).

The biggest models to print are at least 250mm. So no much home printers are able to print that models in their original size. Probably standard printers of 180-200mm z-height can print de-scaled models for childs. But there are printers with 300+mm z-height of the volume, that can be used for printing.

yes, almost home printers cant print this object, except split them into 2 section and then combine them with abs juice, just in case you want to print this.
talk about the socket, i think socket form or size is personal.

Will the socket be strong enough? Even if it's printed solid, it's a very unique set of forces. Would be nice if there was an easy way to measure for the interior.

I remixed the joint cover to fit standard (most common) 30mm diameter prosthetic pylons. This will allow printing the front and rear cover only and attaching to a prosthetic. https://www.thingiverse.com/thing:2763861

Prosthetic Cover Connector
by vtcgeek

yea thank you. should be usefull.
in my place, i just can found alumunium pipe with 31.75mm diameter.
and for the spring, some patient really need the hard one.

Poosthetics cost anywhere from 5-50K and need to replaced every 4-5 year (faster if you are a kid). Thank you for doing this!

really? 5k for a prosthetic leg?

We just hired a guy with a prosthetic leg. When I asked about the cost, he said his was $18,000. Blew me away....

OMG thats too much money (for me at least)

I'm currently undertaking my MSc in Biomedical Engineering, a fellow coursemate works with industry testing prosthetic legs in excess of $43000. They're quite something, they include sensors and processors that move the foot automatically while walking to imitate normal gait (somewhat).

provided you cut cut the aluminum pipe yourself, even getting the other metal parts 3d printed, this wouldn't cost more than 500-600 bucks. Way cheaper than what a normal prosthetic would cost.. good job.

Nice work, I hope you get some donations and support.

Nice Design. I am a Prosthetist and own a company making "traditional prosthetic legs" Other than the socket design which has to be custom molded/printed for each individual patients, this is a pretty nice setup. Worth trying to experiment with.

yes HalDrall, some of patient have unique stump, and so does the socket.
thank you to try this :)

A file with dimensions and tolerances could be useful.

this have been tested in real pacients?? and if you do have what material you used??

I'am a Biomedical engineer and planing to begin a NGO would be a problem if i use this desing obvisly giving you the credit of the desing

yes, this is already tested in real patients, and have some nice suggestions direct from the patient.

Would you consider uploading actual photos of the printed object being used by a patient?

here the photo, i blur the patient's face due the privacy.

Nicely done, this makes me happy!

Nice job!

I would like to ask you something.

My father use a prosthesis to hold his foot straight. This prosthesis is inside the shoe and it cuts the bood flows. I would like to design for him a new one to use outside the shoe. Could you help me?

I think you should do a plaster mold first from the outside of the shoe with the foot.
once you got the cast you could mold a part that you could 3d scan.
you can use a normal digital camera and use wed programs that would give you a 3d image file
them work from there.
hope this helps

very cool I'm also redesigning my Leg Prosthesis but mine is the most difficult because its a full socket down from the knee because its just my foot that's gone but I'm just waiting for my printer so i can start experimenting. i have no printer so saving up for a cheap one anet a8

try a tronxy 802MA its only about £150 and would help you experiment
Kind regards

have the anet for a few months now and after some finetuning and upgrading some small parts is a Great printer
(ist already good now its just better ;)

The anet is a pretty good one. I have it, and it exceeded my expectations! Have fun!