3-D Printing and Design Your Own Object

Transcription

1 3-D Printing and Design Your Own Object ENGR 1182 Class # 15 3-D Printing in the Real-World The Night I Invented 3-D Printing video 1

2 Today's Topics Introduce 3-D Printing Tips to designing parts for the EEIC MakerBots After today's presentation, students will be prepared to design their own object for 3-D printing (actual printing is optional) Only one object per group can be 3-D printed 3-D Printing Overview A standard printer prints flat in two dimensions: x-axis and y-axis A 3-D printer brings into account the vertical dimension (Z dimension) It creates 3 dimensional objects one layer at a time by combining thin layers 2

3 Benefits of 3-D Printing Better than machining since there is a minimal amount of wasted material Traditional machining removes material from a block to create the desired part and is called subtractive manufacturing. 3D printing uses stored material to create the desired part and is called additive manufacturing. How a 3-D Printer Works A process in which molten plastic is layered into three dimensional shapes. A 3-D printer creates layer by layer to form desired object Stretchlet Print at 32X 3-D printers use CAD files to print objects 3-D printing started with simple parts but is expanding to every corner of industry 3

4 Innovative and Emerging 3-D Printing Applications Hershey s invests in printing chocolates Taste testing 3-D food! Project Runway contestant creates fashion with sound waves 3-D print a house: Huffington Post article with animation TED talk presentation Princeton 3-D prints a bionic ear 3-D Printing in EEIC 12 MakerBot Printers Print area: 11 wide x 6 deep x 6 tall The printers melt PLA (polylactic acid) plastic and dispense the melted plastic in thin filaments There are limitation factors with these types of printers 4

5 Design Concerns Object must fit within limits of printer. Needs to have large enough joining areas (joints) in order for object to be structurally sound Overhangs, curves, and hollow features must have enough support to be properly built Objects with an angle between 0 o -45 o of vertical can be printed without supports Check your units! MakerBot Limitations Build time varies with size of object Ø Pre-process of setting up the print on both the computer side as well as the 3D printer Ø Process of laying down fine layers of plastic on top of each other is time consuming Not very good with small details Ø Size limitations Ø Structural integrity of small items Printing plate is not perfectly flat, which can affect printing success of large, flat objects 5

6 Tools for Printing Software will automatically add rafts and/or support material to ensure piece will remain stable during construction. Raft Support Material Tools for Printing Support Material Support geometry printed along with part in order to provide structural support to ensure successful builds Can be removed once print is finished Raft: A surface automatically created by the software to improve printing success This is helpful for smaller objects, although objects with larger surface areas could still warp 6

7 Is this a good Object to Print? Yes, it is simple with over hang that can be printed with support Spheres have a vertical angle that is less that 45 o so it can be printed without much support. NOTE: Do not expect a perfect sphere; expect a slight ellipse

8 At first glance: Yes, it printed fine. But upon a closer look: NO. Connection areas are too small and make the structure weak

9 At first you might think to use support material for the ledges, but in reality it is very difficult to get all the support material out. 17 Printing without support material turns out pretty good! However, notice because of the over hang there is some misplaced strands. Good for show, bad for exact match. 18 9

10 19 NO: There are small details, the text is too fine, and it s hollow with horizontal features in top of helmet

11 Good 3-D Printing Practices All of the parts shown were a successful print, but the parts didn t turn out well. Consider overall, bottom-up construction Orient object for best production Avoid weak points Avoid fine details 21 Assignment Design your own part: Ø Recommended to create a part for your AEV Ø Save your part as both a SolidWorks part file and also as an.stl format for use by the Makerware software Each group must turn in (1) copy of printed Drawing (Isometric & Orthographic with dimensions). Each group can submit a.stl file to the Carmen dropbox if desired to have part printed. 11

12 3-D Printing Summary Adhere to constraints of printer and consider good 3-D printing construction Create your own object (SW-25) Hard copy of detail drawing due in Lab 8A Can submit.stl to Carmen dropbox by 5:00 Friday, March 21 st. Review for your Midterm Exam 2 (Solidworks) and Lab Proficiency Quiz (LPQ) 12