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Draw and design for 3D Printing
Carmelo De Maria
Open Source for
Biomedical Engineering - OS4BME
Rapid Prototyping Process Flow
• Solid Modelling
• Tesselation/Generation of STL file
• Support Generation
• “Slicing” of the Model
• Model Physical Buildup
• Cleanup and Post Curing
• Surface Finishing
CAD/CAM system
Image acquisition
Inkjet
based
Direct
writing
Rapid Prototyping Process Flow
CAD FILE STL FILE GCODE
3D object
Triangle
and vertex
Toolpath
FreeCAD
FreeCAD
(MeshLab)
Slic3r
Printrun to
3DP
File
Description
Software
Rapid Prototyping Process Flow
FreeCAD
www.freecadweb.org
123D Desing
www.123dapp.com
Segmentation
• Segmentation subdivides an image into its constituent
regiorns or objects.
• The level to which the subdivision is carried out depends
on the problem being solved
Softwares for bioimaging analsys
• OsiriX (www.osirix-viewer.com)
• 3DSlicer (www.slicer.org)
• ImageJ (rsb.info.nih.gov/ij)
• MIPAV (mipav.cit.nih.gov)
• itk-SNAP (www.itksnap.org)
EXCHANGE FORMATS
Example of *.stl Representation
Example of *.stl Representation
Representing
a sphere
MeshLab
http://meshlab.sourceforge.net
FROM CAD TO CAM
Processing of *.stl Files
• Machine then processes the *.stl file, slicing it into
many thin layers stacked on one another. The
resulting files are called slice files.
• The shapes of the slices represent cross sections
Support material
Some solid freeform fabrication techniques use two
materials in the course of constructing parts.
The first material is the part material and the second is
the support material (to support overhanging
features during construction).
The support material is later removed by heat or
dissolved away with a solvent or water.
Support Materials and Structures
Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid.
ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
(a) A part with a protruding section which requires support material. (b) Common
support structures used in rapid-prototyping machines. Source: P. F. Jacobs, Rapid
Prototyping & Manufacturing: Fundamentals of Stereolithography. Society of
Manufacturing Engineers, 1992.
Patterning
Vector Raster Projection
G-CODE
G – Code Programming
Originally called the “Word Address” programming
format.
Processed one line at a time sequentially.
Esempio G-Code
;Generated with Cura_SteamEngine 13.11.2
M109 T0 S227.000000
T0
;Sliced ?filename? at: Tue 26-11-2013 17:33:05
;Basic settings: Layer height: 0.2 Walls: 0.8 Fill: 20
;Print time: #P_TIME#
;Filament used: #F_AMNT#m #F_WGHT#g
;Filament cost: #F_COST#
G21 ;metric values
G90 ;absolute positioning
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F?max_z_speed? ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E3 ;extrude 3mm of feed stock
G92 E0 ;zero the extruded length again
G1 F9000
M117 Printing...
;Layer count: 179
;LAYER:0
M107
G0 F3600 X87.90 Y78.23 Z0.30
;TYPE:SKIRT
G1 F2400 E0.00000
G1 F1200 X88.75 Y77.39 E0.02183
G1 X89.28 Y77.04 E0.03342
G1 X90.12 Y76.69 E0.05004
G1 X90.43 Y76.63 E0.05591
G1 X91.06 Y76.37 E0.06834
...
Cura
Slic3r
Stratasys Catalyst
Stratasys Catalyst
Exercises
Cura Slic3r
Slice time
Estimated print time
Used Material
Gcode size

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2014 12-22 - draw and design for 3 d printing (cd)

  • 1. Draw and design for 3D Printing Carmelo De Maria Open Source for Biomedical Engineering - OS4BME
  • 2. Rapid Prototyping Process Flow • Solid Modelling • Tesselation/Generation of STL file • Support Generation • “Slicing” of the Model • Model Physical Buildup • Cleanup and Post Curing • Surface Finishing
  • 4. CAD FILE STL FILE GCODE 3D object Triangle and vertex Toolpath FreeCAD FreeCAD (MeshLab) Slic3r Printrun to 3DP File Description Software Rapid Prototyping Process Flow
  • 7. Segmentation • Segmentation subdivides an image into its constituent regiorns or objects. • The level to which the subdivision is carried out depends on the problem being solved
  • 8. Softwares for bioimaging analsys • OsiriX (www.osirix-viewer.com) • 3DSlicer (www.slicer.org) • ImageJ (rsb.info.nih.gov/ij) • MIPAV (mipav.cit.nih.gov) • itk-SNAP (www.itksnap.org)
  • 10. Example of *.stl Representation
  • 11. Example of *.stl Representation Representing a sphere
  • 13. FROM CAD TO CAM
  • 14. Processing of *.stl Files • Machine then processes the *.stl file, slicing it into many thin layers stacked on one another. The resulting files are called slice files. • The shapes of the slices represent cross sections
  • 15. Support material Some solid freeform fabrication techniques use two materials in the course of constructing parts. The first material is the part material and the second is the support material (to support overhanging features during construction). The support material is later removed by heat or dissolved away with a solvent or water.
  • 16. Support Materials and Structures Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. (a) A part with a protruding section which requires support material. (b) Common support structures used in rapid-prototyping machines. Source: P. F. Jacobs, Rapid Prototyping & Manufacturing: Fundamentals of Stereolithography. Society of Manufacturing Engineers, 1992.
  • 18. G-CODE G – Code Programming Originally called the “Word Address” programming format. Processed one line at a time sequentially.
  • 19. Esempio G-Code ;Generated with Cura_SteamEngine 13.11.2 M109 T0 S227.000000 T0 ;Sliced ?filename? at: Tue 26-11-2013 17:33:05 ;Basic settings: Layer height: 0.2 Walls: 0.8 Fill: 20 ;Print time: #P_TIME# ;Filament used: #F_AMNT#m #F_WGHT#g ;Filament cost: #F_COST# G21 ;metric values G90 ;absolute positioning M107 ;start with the fan off G28 X0 Y0 ;move X/Y to min endstops G28 Z0 ;move Z to min endstops G1 Z15.0 F?max_z_speed? ;move the platform down 15mm G92 E0 ;zero the extruded length G1 F200 E3 ;extrude 3mm of feed stock G92 E0 ;zero the extruded length again G1 F9000 M117 Printing... ;Layer count: 179 ;LAYER:0 M107 G0 F3600 X87.90 Y78.23 Z0.30 ;TYPE:SKIRT G1 F2400 E0.00000 G1 F1200 X88.75 Y77.39 E0.02183 G1 X89.28 Y77.04 E0.03342 G1 X90.12 Y76.69 E0.05004 G1 X90.43 Y76.63 E0.05591 G1 X91.06 Y76.37 E0.06834 ...
  • 20. Cura
  • 24. Exercises Cura Slic3r Slice time Estimated print time Used Material Gcode size