Slideshow from Makerfest India workshop

1. DIY scanning for 3D printing: an
overview
Sophie Kahn, Natalia Krasnodebska
and Lauren Slowik

2. Why 3D scan?
3D scanning brings real-world
objects into the digital realm
-Save modeling time
-Scale up or down
-Modify or remix objects
-Output them in different
materials, using different
technologies (3D printing,
CNC milling, etc)

3. Types of 3D
scanning
-Laser line
-Structured light
-Photogrammetry
-Time-of-flight
-Contact

10. To create a
Kinect scanning
setup
-Office chair that spins
-Bright lamp
-Microsoft Kinect v1 or v2
-Kinect drivers and SDK
-Skanect software

11. DAVID structured light/laser
scanning

12. DAVID
laserscanner
You will need:
-Focusable laser diode and battery
pack, or laser level from a hardware
store
-Webcam: the higher res and faster
fps the better (I use The Imaging
Source)
-Printed calibration panels
-Cardboard/plywood
-Set square

13. DAVID
structured light
You will need:
-Pico projector
-Calibration panels
-Webcam (the higher-res and
higher fps, the better)
-Small desktop tripod
-Dual head for tripod
-Two rotating ball tripod mounts
-Turntable (optional but helpful)

14. -White spray paint or removable
spray powder (talc developing
spray, dry shampoo)
-White play-doh for registering
multiple scans
-Black spray paint
-Black painted blocks to serve as
props
-Helping hands tool
-Black velvet to mask out
background
Useful
accessories for
3D scanning
small objects:

15. Steps to make a
DAVID scan
-Set up calibration panels at 90
degrees, using a set square for
accuracy
-Calibrate camera
-Prepare and stabilize your object
-Scan in sweeps, rotating object
and flipping as needed
-Register scans in DAVID
Shapefusion
-Fuse surface and export

16. Repairing files for 3D print

17. What does a 3D printer
need in a file?
-File must be “watertight” (one solid form, no holes)
-File must have no geometry errors (all polygons
face same way, etc)
-File must be correct thickness
-File must be structurally sound

18. Workflow to
prep scan for
3D print
-Fill holes in scan file &
make solid (Meshmixer)
-Smooth and sculpt
(Meshmixer)
-Repair geometry
(Netfabb)
-Export .stl for printer
(Netfabb)

19. Repairing files with
Meshmixer

21. Fill holes in
Meshmixer:
Edit->Close Cracks
Edit->Make Solid

22. Smooth in
Meshmixer:
Edit->Brushes->Shrink
Smooth/Bubble
Smooth/RobustSmooth

23. Steps to repair
in Netfabb
Basic
-Fill any remaining holes using rt-
click->Fill Hole
-Remove unnecessary shells
-Run basic repair & apply
-Trim object and removed trimmed
parts if necessary
-Fix any bad geometry by deleting
and re-adding triangles
-Run basic repair one last time
-Export as .stl

26. Additional steps
in Netfabb Pro
-Wrap part surface if object is
severely corrupted
-Reduce triangle mesh to
<1,000,000 polygons
-Hollow model to desired wall
thickness
-Add drain holes using Boolean
operations
-Run wall thickness visualization to
check structural integrity