Show off your skills and solve real design problems
FATHOM is challenging all designers and engineers to think differently about how they design and manufacture products today by leveraging the unlimited design freedom made possible through additive manufacturing. From prototypes to production, the winning submission selected by a panel of judges in FATHOM’s Make the Unmakeable Challenges of 2015 will demonstrate an original way 3D printing can enhance the product development process.
Throughout 2015, FATHOM will be holding three different challenges, all hosted through GrabCAD. In addition to scoring great prizes, the winning design of each of the three Challenges will be judged for a grand prize. In September of 2015, the ultimate Make the Unmakeable champion will win a professional 3D printer from FATHOM.
CHALLENGE #1: CREATIVE SOLUTIONS FOR NEW YEAR’S RESOLUTIONS
Introducing FATHOM’s first challenge of many for 2015 — every New Year’s Eve, nearly half the population sets resolutions for self-improvement. Whether it’s logging those 10,000 steps per day or finally signing up for that volunteer program, people have the best intentions in mind. By the end of January, though, only 64% of people who set resolutions are still on track, and halfway through the year, that number drops to 46% (source).
How can you help people follow through with their resolutions, or even get back in the game if they’ve already slipped? Capitalizing on the immense design freedom of additive manufacturing, your task is to invent a product (or innovate an existing one) that will help people improve their lives and hold true to the promises they’ve made to themselves.
Here are five of the most common resolutions people reported for 2015:
- Lose weight / stay fit and healthy
- Get organized
- Spend less / save more
- Quit smoking
- Spend more time with family
What are some challenges you face? How about the challenges your family and friends face? How could you solve or improve these challenges with 3D printing? From building custom prosthetics for children to facilitating the preservation of ancient sculptures, FATHOM exhibits a deep passion for improving the world we live in by leveraging the team’s creativity, innovation, and expertise with professional 3D CAD software and additive manufacturing technologies.
With this challenge, we turn to the GrabCAD community what can you FATHOM?
You must include:
- STEP, IGS file;
- STL file;
- Visual presentation with renderings of design with clear and concise explanations;
- Description on how your design is the best solution and why it is the winning design for this Challenge (300-500 words preferred but not required).
Designs will be judged with the following in mind:
- Design Freedom: Exploration into unique geometries that can only be made using 3D printing and additive manufacturing;
- Structural Optimization: Exploration into how 3D printing and additive manufacturing can improve upon lean and efficient design;
- Advanced Manufacturing: Exploration into how 3D printing and additive manufacturing can increase the efficiency of how products are manufactured today.
- Native CAD file is encouraged.
- Video submissions are encouraged.
Technical requirements:
- Consider scales and options as the winning design will be 3D printed at one of FATHOM’s production centers — could be built on any of our machines, from the FDM-based Fortus 900mc with a build tray size of 36 x 24 x 36 in to the PolyJet-based Objet500 Connex3 with a build tray size of 19.7 x 15.7 x 7.9 in and the widest range of multi-material options library
- For all assembly submissions, follow guidelines specified in Rhino and SolidWorks White Papers by FATHOM:
o Preferred file naming convention for single material builds should identify project name, technology, material, and color (if applicable);
o Preferred file naming convention for multi-material or multi-technology builds should identify project name, material, and color;
o Single files should be organized in folders that identify technology.
BY REGISTERING FOR THE COMPETITION, YOU ACCEPT THE CONDITIONS STATED IN THE OFFICIAL RULES (http://blog.grabcad.com/make-unmakeable-challenge-official-rules/), agree to be bound by the decisions of the judges and warrant that you are eligible to participate in the competition. If you do not accept all of these official rules, then please do not register for the competition. We recommend that you print a copy of these official rules for your future reference.
Must be 18 years of age or older to participate. No purchase necessary. Void where prohibited.
THESE OFFICIAL CHALLENGE RULES SUPERSEDE OUR GENERAL GRABCAD CHALLENGE RULES AND TERMS & CONDITIONS.
This Challenge starts on February 24, 2015 and ends on April 6, 2015.
The winners will be announced by May 4, 2015.
Awards for Top 20 places.
- $2,500 credit for 3D printing services from FATHOM production centers (includes PolyJet, FDM, and SLS technologies, excludes model finishing);
- Extensive press coverage through industry-leading publications;
- Featured in the FATHOM trade show booth at highly publicized events located all across the United States;
- The winners of each of the three (3) challenge Competitions will be assessed and evaluated by the Judges for the grand and ultimate prize, which will be announced in September 2015: the ultimate Make the Unmakeable champion will win a (uPrint SE 3D printer by Stratasys) from FATHOM (value $15,900);
- Custom 3D printed trophy designed and 3D printed by FATHOM.
- $100 USD cash;
- 20% discount promo code for SmartQuote, FATHOM’s online tool for 3D printing quotes and orders;
- Custom FATHOM thank you package (t-shirt and other branded items);
- Press coverage through industry-leading publications;
- 20% discount promo code for SmartQuote, FATHOM’s online tool for 3D printing quotes and orders.
FATHOM is driven by advanced technologies that enhance our customers' product development process. We change the way products are being designed and manufactured by helping designers and engineers make the unmakeable, innovatively compressing industry standard lead-times so products go to market faster and more efficiently. Every day industry-leading companies leverage FATHOM’s 3D printing expertise to put satellites into orbit, electric cars on freeways, and a full spectrum of devices into people’s hands and homes. The FATHOM team is uniquely blending additive technologies and materials with legacy manufacturing methods so companies can go from concept to prototype to manufacturing in a way that wasn’t previously possible. Our product portfolio includes professional 3D printers and manufacturing systems, prototyping and advanced manufacturing services, with design and engineering resources in support of these. We strive to be our customers’ preferred partner by providing best-in-class equipment, services, and support.
If you don't receive the email within an hour (and you've checked your Spam folder), email us as confirmation@grabcad.com.
103 comments
Tommy Mueller almost 10 years ago
A lot of documentation included, terrific! Should be one excellent challenge :)
Good rewards too, thanks Fathom
Tommy Mueller almost 10 years ago
Let me rephrase that... truly amazing and exceptionally awesome rewards. Just checked out that uPrint SE printer!
Winston Jennings almost 10 years ago
Yet another interesting challenge! I like the freedom of creativity this one provides. Happy modeling everyone!
Manolo Valenzuela almost 10 years ago
The objetives are not clear for me, I will wait for the first entry. 8 )
James almost 10 years ago
You're wanting STEP or IGES format as a submission format, but you are also saying that you will be converting either of said formats to polygonal format for 3D printing.
When having a 3D printing related contest in which winning entries will be 3D printed, not requesting a polygonal format such as STL for entries is not a good way of conducting such a contest. Here's why.
1. If you don't spend sufficient time making the conversion true enough to the original solid format participants could have their work discarded for not being readily convertible.
2. The CAD operator might not have enough time to go over an entire design looking for areas that need or don't more faceting, which could also cause a disqualification. Slicing software for 3D printing, all of which use polygonal format, can only handle a limited number of polygons, consequently, in some cases I will combine multiple STL parts together in polygonal based software in order to attain the proper result while staying within the triangle count limits. I could spend weeks in some cases preparing a STL file for 3D printing. Will the same attention to detail be expended on my submission?
3. What about conversion errors? Who will be spending the time to fix these errors if they should arise?
4. What if I'd like to include elements of design that cannot be attained via solid modeling format, such as if I wanted to include sculptural elements for example derived from digital sculpting software like Zbrush?
I do realize that GrabCAD is slanted towards solid model formats, however, in two previous contests related to 3D printing, both the GE contest and the 3D Printer World contests allowed the submission of STL file format.
Sara Sigel almost 10 years ago
@James Great point! We've updated the requirements to be consistent with our other 3D printing focused Challenges - STL required and added STEP/IGS/Native formats as encouraged, not required. We'll work on getting answers to other questions soon. Keep 'em coming!
Jesse West almost 10 years ago
Are there any restrictions on hardware/non-3D printed parts (screws, springs, etc.)? Is someone going to assemble my piece after printing, or does it have to be one piece or print-in-place?
FATHOM Marketing Team almost 10 years ago
Hi James— Thank you for your question! Our team would prefer that entries include STEP or IGES plus STL. We want to give designers the flexibility to provide their best file output. If STEP or IGES isn't available, STL is an acceptable format. STEP or IGES is preferred.
FATHOM Marketing Team almost 10 years ago
Hi Jesse— No restrictions on hardware. If assembly is required, please include in documentation.
Ernesto Chavez almost 10 years ago
The link to the SolidWorks white paper posted in the technical requirements doesn't seem to work.
FATHOM Marketing Team almost 10 years ago
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seghier khaled almost 10 years ago
i don't understand this challenge about what ?
FATHOM Marketing Team almost 10 years ago
Hi Seghier—FATHOM is challenging designers and engineers to invent a new product or innovate an existing product that would help someone with their New Year's resolutions. We've listed examples of common goals for people: lose weight/stay fit and healthy, get organized, spend less/save more, quit smoking, and spend more time with family. For example, a wearable that could help someone get organized. How could you solve or improve these challenges with 3D printing? Does that help?
FATHOM Marketing Team almost 10 years ago
Very exciting to see all of the entries coming in! Stay tuned as we will be sharing Q&A's with our designers and engineers for your inspiration!
3D concept almost 10 years ago
That's good news
Ridwan Sept almost 10 years ago
can we combine 3D printing with some mechanical, electrical components?
FATHOM Marketing Team almost 10 years ago
Ridwan—Yes. Blending 3D printing with stock components is definitely encouraged.
FATHOM Marketing Team almost 10 years ago
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#David almost 10 years ago
@Fathom, I've been trying to register on your website to check out the smartquote feature but have had issues with getting a verification email to validate my account (checked my spam and junk mail folders). Also, tried a few different browsers. LMK
pummuq almost 10 years ago
Thank you
FATHOM // Elizabeth Griffin,it's help me a lot.
FATHOM Marketing Team almost 10 years ago
David—Send me an email directly and I will look into that. Thanks! (elizabeth@studiofathom.com)
FATHOM Marketing Team almost 10 years ago
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FATHOM Marketing Team almost 10 years ago
61 entries and 20 days to go! Will you be the Make the Unmakeable winner of the first challenge?
Kristopher almost 10 years ago
Does the entry have to be made in solidworks or rhino? Can I use a different program and supply the STEP and STL formats?
FATHOM Marketing Team almost 10 years ago
@Kristopher—You're welcome to use any software. Just need a STEP or STL file to submit. Thanks for asking!
Jonathan Brazeau almost 10 years ago
do these have to be 3D printable? why are people entering stuff that's not 3D printable?
#David almost 10 years ago
This is a cool challenge, but it looks like the incentives don't quite work for folks like me who have 3D printers already. Can that $2,500 in 3D printing credit be turned into a cash award by the winner?
FATHOM Marketing Team almost 10 years ago
@Jonathan—All entries should be made with the intent to 3D print. Stock components and other processes can be included, but this is a challenge focused on 3D printing.
FATHOM Marketing Team almost 10 years ago
@David—Great question! It is not a cash reward because we have many types of 3D printing available. Say, for example, you only have an FDM printer. Our services include FDM, PolyJet, and SLS in a wide variety of material options. Plus, now you don't have to spend money on material for your printer. Thanks for asking for clarification!
FATHOM Marketing Team almost 10 years ago
[ ANNOUNCEMENT ] We've added some GREAT judges to the Make the Unmakeable Challenge! Check it out!
Tommy Mueller almost 10 years ago
Woot! Woot!
FATHOM Marketing Team almost 10 years ago
Remember, there is no limit to how many entries! There are 14 days before this contest closes!
FATHOM Marketing Team almost 10 years ago
Thanks for your submission, Matt!!!!
Jonathan Brazeau almost 10 years ago
unfortunately 3D printing services are not "valued" enough by the zeigeist yet. The average person, even engineer doesn't know enough about 3D printing to understand the true value of the prize. If it were a cash reward, you would see many more entries. So far, not a lot of traction...still doesn't make it any less of an awesome challenge though... I won't have time to do this one though.....*sigh.
FATHOM Marketing Team almost 10 years ago
@Jonathon—Sorry to hear that you won't be able to submit. The fact that each challenge winner has a chance to win a uPrint SE 3D printer (commercial grade) in addition to awesome services is pretty cool. I think that's worth it, don't you? We're excited to gift a really cool 3D printer to the ultimate Make the Unmakeable champion. Perhaps you will enter the 2nd challenge. We are running three challenges total before naming the big winner.
Jonathan Brazeau almost 10 years ago
If I could give you some feedback, This is obviously putting the fact of just doing a challenge, "for the fun of it", aside....I think a lot of people don't see themselves winning the top design award, it's a great award ofcourse, but it's all or nothing. It's also a pretty damn big piece of equipment, sort of limits who can use it. A larger industrial unit like that would be harder to sell also. I would have spread that 15,900$ printer prize over top ten for each challenge, 4000/3, 3000/3, 2000/3$ for top three, then 1000/3$ for the remaining 7 spots... psychological it make people feel like they have more of a chance... :)
Jonathan Brazeau almost 10 years ago
again, putting the "just doing it for the fun of it" aside, when I weigh my options between doing a design contract worth 2g's, which I'm guaranteed to be paid, vs. a design competition with a possible 16K payout, which is less likely outcome. Then I'm going to go with the safer contract.... now if those rewards would have been more spread out, then I'd be a little more willing to devote some time it :). It comes down to time vs. money. If you're a retired engineer twittling your thumbs at home all day, then eh. Ya got nothing to loose :)
FATHOM Marketing Team almost 10 years ago
@Jonathan—Appreciate your input!
Jonathan Brazeau almost 10 years ago
hopefully by the time the other two competitions come around I'll have a little more free time to submit something..
FATHOM Marketing Team almost 10 years ago
@Jonathan—We hope so for you!
FATHOM Marketing Team almost 10 years ago
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Ivan Tilev almost 10 years ago
Hi
Question to FATOM?
My design consist of 50 parts assembly. Following white papers for exporting to *.stl from SolidWorks "Save all components of an assembly in a single file" is DESELECTED. So it exports 50 stl files instead of 1stl file. Please confirm it!
Ivan Tilev
FATHOM Marketing Team almost 10 years ago
@Ivan—Yes, that makes it easier for our team to assign multiple materials on a PolyJet build. For evaluation of the design, it may be better to just upload the assembly file to GrabCAD as a STEP file.
Ivan Tilev almost 10 years ago
Thanks!
FATHOM Marketing Team almost 10 years ago
Exciting that we have passed 100 entries! Keep the ideas coming! Only 4 days left before the first challenge closes.
Anett Jakab almost 10 years ago
Hi! I have a huge, 1.7 GB .stl file and a 700 Mb IGES file. Grabcad doesn't let me upload the files, it always stops uploading after some minutes. I tried to decrease the size during the saving process as mush as I could but it's large anyway. What should I do?
Tommy Mueller almost 10 years ago
Hey Anett. Try "Zipping up" your files and splitting them into volumes. A program like WinRAR will let you choose the volume size too! 1.7 GB @ 17 100MB volumes.
Kristopher almost 10 years ago
So we can submit entries through midnight on April 6?
FATHOM Marketing Team almost 10 years ago
@Anett—We also recommend zipping files.
FATHOM Marketing Team almost 10 years ago
@Kristopher—Contest ends at 11:59 pm Eastern Time, on April 6, 2015.
Kristopher almost 10 years ago
Thanks for the clarification. Making final touches and refining supporting documents but excited to get it submitted.
FATHOM Marketing Team almost 10 years ago
@Kristopher—Great!
Anett Jakab almost 10 years ago
Thank you for your reply but I still cannot upload. I made 100 MB and 60 MB file sizes of compressed files but it still does not upload. I will put a dropbox link into the text box though I am not sure that my application will be valid this way. Can any of the organisers add my files (2) to my official application on Grabcad from my dropbox folder?
Scott Rodgers almost 10 years ago
I've also had some troubles with uploading, but luckily they've been small and I just tried until it worked. The advanced uploader seems to work better.
Anett Jakab almost 10 years ago
I still keep trying to upload :)
Ben Ewing almost 10 years ago
Hi Anett Jakab, I'm sorry that you're having this problem! If you could send me an email at ben@grabcad.com with a link to your dropbox, I'll help you get set up!
Kristopher almost 10 years ago
Why does the deadline say we have 5 hours left if we have until 11:59 p.m. Eastern Time?
Ben Ewing almost 10 years ago
Hi Kristopher, sorry about that! The counter should now accurately show how much time is left. Good luck!
Kristopher almost 10 years ago
Thanks, had me worried there for a minute
Kristopher almost 10 years ago
Your time is still off by an hour.
Kristopher almost 10 years ago
Yep and I've stayed up late enough. I guess I'll deal with it tomorrow and see if they'll still let me submit.
Scott Rodgers almost 10 years ago
This was an interesting challenge, with some really interesting entries.
...and some entries where the submitter didn't read the requirements.
Looking forward to the next challenge. Hope I can create an entry I'm happy with on that one too.
Steve Wright almost 10 years ago
Oh know i thought the dead line was at the weekend..is it possible for a late entry ...Pleeeeeeeaaasseee...lol
Scott Rodgers almost 10 years ago
Better luck next time, Steve.
...and there will be a next time, and a next time after that!
Scott Rodgers almost 10 years ago
Will the finalists be announced prior to May 4th?
Ben Ewing almost 10 years ago
Hi Scott. Yes, the finalists will be announced tomorrow, April 28th. Stay tuned!
Ernesto Chavez almost 10 years ago
How soon after can we expect Make The Unmakeable Challenge #2?
Scott Rodgers almost 10 years ago
We'll probably see the next challenge in a week or so.
Maybe Challenge #2 starting early May, judging happens in June.
Maybe Challenge #3 starting early July, judging happens in August.
Leaving a little time for the judges to select and announce the Grand Champion in September.
Bar Danino almost 10 years ago
Is there an estimate for posting winners? (At what time)
Ben Ewing almost 10 years ago
Hi Bar Danino, the finalists will be announced by 7 PM UTC today!
Bar Danino almost 10 years ago
ok, thank you!
Ben Ewing almost 10 years ago
I'm happy to announce the finalists for the Make the Unmakeable Challenge #1: https://grabcad.com/challenges/make-the-unmakeable-challenge-1/results! We're really excited by everything that all of these great designs offer. The honorable mentions will be announced along with the winner on May 4th. Congratulations to the finalists and to all of the entrants!
FATHOM Marketing Team almost 10 years ago
Thanks Ben—FATHOM is looking forward to the big announcement on May 4.
Abhijeet Das almost 10 years ago
Thank you GrabCAD and Fathom for this great challenge! Will try my best in the next one!! Congrats finalists!!
Kristopher almost 10 years ago
I'm curious, how can some of the finalists make the cut if there is no clear correlation between their entry and a new year's resolution? I don't doubt their creativity and application to an "unmakeable" model but wasn't part of the criteria to help with a resolution? Just some clarity on this end would be helpful for the 2 remaining challenges. I respect the judges decisions and look forward to seeing the winner to better help on the upcoming challenge.
Patel Deepak almost 10 years ago
Congrats to the finalists..:)
and to all the creative entries :)
All the finalist designs have that creative curve in thier designs, it will be nice to see them 3d printed.
FATHOM Marketing Team almost 10 years ago
Kristopher, great question! Designs were judged with the following in mind, in addition to the New Year's Resolution theme: Design Freedom—exploration into unique geometries that can only be made using 3D printing and additive manufacturing; Structural Optimization—exploration into how 3D printing and additive manufacturing can improve upon lean and efficient design; Advanced Manufacturing—exploration into how 3D printing and additive manufacturing can increase the efficiency of how products are manufactured today. Judges have asked some of the entries to clarify how it fits the theme.
Kristopher almost 10 years ago
Thanks Elizabeth!
FATHOM Marketing Team almost 10 years ago
Kristopher, wishing you all the best in the next challenge. There are still two chances to be named the 3D printer winner. We will be announcing soon. Also, there is no limit to the amount of entries per each contest and you are welcome to ask for feedback during the challenge.
Ridwan Sept almost 10 years ago
congrats to all winners
Ridwan Sept almost 10 years ago
are the point of the judging is one assembly created with 3D printing directly?
FATHOM Marketing Team almost 10 years ago
Thanks, Matt, for sharing your vote!
FATHOM Marketing Team almost 10 years ago
Ridwan—Yes, the series of three challenges this year is focused on designing for additive manufacturing technologies. We are challenging designers and engineers to think differently about how to design and manufacture product. One of the greatest benefits of additive manufacturing is the unlimited design freedom to create what was once impossible and improve efficiency like never before.
Ali ZAHI almost 10 years ago
Congratulations to all finalists!
Lisa almost 10 years ago
Jason-444 Excellent!
Scott Rodgers almost 10 years ago
I was quite surprised at the list of finalists. I just hope the winner is one of the few that truly embraced the theme of the challenge, "Creative Solutions for New Year's Resolutions".
Scott Rodgers almost 10 years ago
So what happens if a finalist doesn't connect their entry to the theme?
To tell the truth, I only started designing my Improvement Counter after seeing so many entries that were great designs, but had nothing to do with setting and/or achieving goals. I'm sorry for sounding like a sore loser, but it stings to see some of those goalless entries as finalists.
FATHOM Marketing Team almost 10 years ago
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Ridwan Sept almost 10 years ago
Hi, Could one of the jury tell me and share the judgement criteria about my design UNMAKEABLE-NYR-QS-C&A
I just need feedback so I can focuessed at that point in the next challenge.
Scott Rodgers almost 10 years ago
Ridwan,
My guess is they wanted something you couldn't make except with 3d printing. I used to design for injection molding, and I think most of your design could be made that way. Quality work, but it wasn't what they were looking for. Maybe next time incorporate a Klein Bottle into your design. Or you can wait and see which one wins this round and emulate their strategy.
Jose almost 10 years ago
"Grow Pod_2" by devin.sidell-1 has my Vote.
This is an excellent mix of aesthetic design meeting function. It's clear there's a real understanding of what a plant needs in order to grow here as well as pushing want can't be normally manufactured. As someone who has killed many seedlings through trial an error I would love to see something like this in real life. A pleasing center piece in my household becoming a reminder of the healthy food I have to look forward to.
Grow Pod_2
FATHOM Marketing Team almost 10 years ago
Hi Ridwan—Don't hesitate to ask for feedback in the next challenge! Thank you for participating. Think of this challenge as a warm up. Two more chances to win a 3D printer!
FATHOM Marketing Team almost 10 years ago
Hi Jose—Thank you for your feedback!
Tayyab Mubeen almost 10 years ago
Congrats to finalists, Hi Elizabeth,
I had mentioned in my entry that my design is out of box. while reviewing the finalists found Jason's and Ben's entries. no doubt both are fine piece of work but it tickles me to ask your feedback on mine.
Ben Ewing almost 10 years ago
The winners have been announced: https://grabcad.com/challenges/make-the-unmakeable-challenge-1/results. Congratulations to the winners! There were so many unique designs for this amazing challenge. To pick the winners, the judges took an in-depth look at how each finalist stacked up in terms of of design freedom, structural optimization, and advanced manufacturing techniques. Thank you to everyone who participated in this exciting challenge and be sure to check out the next Fathom challenge that launched today: https://grabcad.com/challenges/make-the-unmakeable-challenge-2!
Devin Sidell almost 10 years ago
Thanks so much to Fathom and all of the judges! It is truly an honor to be considered for this challenge. Congratulations to all of the participants, especially the runners up/honorable mentions as well! This has been a great experience and I'm excited to see how the next 2 challenges go!
Devin Sidell almost 10 years ago
Thanks matt! Looking forward to seeing your entry in the 2nd challenge.
AG Akshay almost 10 years ago
Thank you so much Fathom and all other judges.....it was really a nice experience....!!!!
Ben Ewing almost 10 years ago
Congrats again everyone! I just wanted to let the winners know that we will be in touch later this week regarding the prizes. If you have any questions in the mean time, feel free to email me at ben@grabcad.com.
FATHOM Marketing Team almost 10 years ago
Congratulations to everyone and big thank you to all who participated! Be sure to check out the #2 challenge that is now live at: https://grabcad.com/challenges/make-the-unmakeable-challenge-2
FATHOM Marketing Team over 9 years ago
Hello everyone! We sent another email notification about prizes out this week. All winners—please let me know if you did not receive an email from me this week.
Ben Ewing about 9 years ago
In conjunction with FATHOM, we are super excited to announce that the Ultimate "Make the Unmakeable" Winner is Casey Rogers, the winner of the 3rd challenge. All three winners had submitted unique designs to the 3D printing challenge so it was very hard for the judges to pick just one champion. To select the ultimate winner, the judges took an in-depth look at how each finalist stacked up in terms of design freedom, structural optimization, and advanced manufacturing techniques. Congratulations to all of the winners—Devin Sidell ranked first place in round one, Winston Jennings ranked first place in round two, and Casey Rogers ranked first place in round three. Thanks to everyone who contributed to these innovative challenges!
Ben Ewing about 9 years ago
Casey's winning design can be seen here: Quadcopter Universal Gripper Accessory
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