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Transcript of 3-D Printing and Design Your Own Object Printing and Design Your Own Object ENGR 1182 ... Build time...
3/1/14
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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
§ http://www.cnn.com/2014/02/13/tech/innovation/the-night-i-invented-3d-printing-chuck-hall/
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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
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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
§ 3-D printers use CAD files to print objects
§ 3-D printing started with simple parts but is expanding to every corner of industry
Stretchlet Print at 32X
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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
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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 0o-45o 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
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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
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Is this a good Object to Print?
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§ Yes, it is simple with over hang that can be printed with support
§ Spheres have a vertical angle that is less that 45o so it can be printed without much support.
§ NOTE: Do not expect a perfect sphere; expect a slight ellipse.
Is this a Good Object to Print?
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Is this a Good Object to Print?
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§ At first glance: Yes, it printed fine.
§ But upon a closer look: ‘NO’. Connection areas are too small and make the structure weak
Is this a Good Object to Print?
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Is this a Good Object to Print?
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§ 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.
Is this a Good Object to Print?
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§ 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.
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Is this a Good Object to Print?
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Is this a Good Object to Print?
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§ NO: There are small details, the text is too fine, and it’s hollow with horizontal features in top of helmet.
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Good 3-D Printing Practices
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§ 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
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.
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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 21st.
§ Review for your Midterm Exam 2 (Solidworks) and Lab Proficiency Quiz (LPQ)