One Inch Woody…

May 23rd, 2013 at 8:33 AM ^

3D printing is essentially laying down lines of a melted plastic which almost instantly solidify upon deposition. Because the solidified plastic has an appreciable volume as opposed to ink, the printer can stack these layers of solidified plastic on top of each other to create a 3D shape. It's somewhat opposed to CNC, which takes a CAD file and makes the product through subtractive processes (milling, lathe, etc.). Here, a 3D printer can take a CAD file and additively build up to it by adding layers of plastic.

I'm almost sure that Prof. Hollister didn't use "3D printing" per se, but a similar technique (photolithography) consisting of a large vat of liquid polymer that, when exposed to laser light of a certain energy, will cross link to form solid shapes. If the area of the laser beam is small, the prototype can have tight tolerances with respect to curves.

Professor Hollister is a really nice guy so I'm happy that he's getting the recognition that he deserves for this project.

Steweiler

May 23rd, 2013 at 12:44 PM ^

Well said.  Let me add that "3D Printing" has become the generic term for all rapid prototype or additive manufacturing processes (objects built in layers), but the types of machines and processes that are used are as different as night and day.  I have 6 laser-based Rapid Prototyping machines in my lab, and they are light years better than the $2000.00 hobbyist-based extruders that you can order off the internet.  It irks me to no end when the two are lumped together!!  

The device in this article was built using a Selective Laser Sintering (SLS) machine, which uses a Co2(hot) laser to sinter or melt plastic powder in 0.004" layers at a time into the shape of the part.  

BiSB

May 23rd, 2013 at 8:06 AM ^

I feel like medical dramas are going to be a little different in this brave new world: "DAMNIT doctor, we got another PC Load Letter error..."

LSAClassOf2000

May 23rd, 2013 at 8:35 AM ^

That is a great story and hopefully Kaiba makes a full recovery. 

I believe 3D printing is also known as "additive manufacturing" - it's been used in some fields, such as automotive engineering, since the late 1970s, I believe. The biomaterial application is relatively new, from what I understand - basically, the idea is to be able to build living systems in successive layers using inkjet techniques. 

Here's a story from the BBC on how they used the technique by layering cells in a sugar medium to study the possibility of building organs - (HERE). Awesome possibilities, and it is good to know a child will live because of these techniques. 

BlueRude

May 23rd, 2013 at 8:47 AM ^

Hope the future bodes well for the baby. SLS. Stereo Lithography System. First used it for A-C vents where the flaps actually move as well.

Don

May 23rd, 2013 at 9:14 AM ^

"Coach Hart, here is the list of the spots we need to fill for Team 174."

"Hmmmm...  a Wheatley, a Harmon, two Longs, a Lewan, one Howard, two Woodsons, one Robinson, three Peppers, two Hands, one Kovacs, one Branch, one Paris, one Carter, one Morris, one Griese, and two Woodleys... looks good, but let's add a Molk. Fire up the printers!"

LB

May 23rd, 2013 at 9:29 AM ^

Professor Hollister on a research project. She speaks very highly of him.

I'm happy to see this kind of joint effort on a life-saving solution.

E. Gordon Gee

May 23rd, 2013 at 9:34 AM ^

As someone working in the medical device sector, I love hearing stories like this. I'll make sure to share this with others in the field. Thanks for posting this and Michigan contribution to research and developement in the BME/medical device field.