Ch.16 Post-Processing, Ch.17 Software Issues

Question 1

What are the key material property considerations when selecting a secondary support
material for material jetting and material extrusion?

How is it different for metals?

Answer 1

melt/dissolve in water-based solvent
compatible for print, not interfere with build material
easily removable

for metals, use a weaker alloy or low-melting temp material than part that can be chemically dissolved

Question 2

what process parameter combination to look for that creates parts with accuracy and precision?

Answer 2

process parameter combination that yields the smallest shrinkage variation

Question 3

why is larger shrinkage value found in the x-y plane than in z-direction before post-processing?

Answer 3

layer laid in x-y plane –> time gap between layers –> shrinks more

raster fill pattern different strength in x-y plane

Question 4

what are natural supports and what are the processes that use natural supports?

Answer 4

• build material naturally surrounds part
• powder-based/sheet-based

processes
PBF
binder jetting
bond-then-form sheet lamination

Question 5

what are synthetic supports and what are the processes that use it?

Answer 5

intentionally creating structure to support, restrain, or attach part
- requires post-processing to be removed

Processes
MEX
MJ
VP
DED

Question 6

Why might it be possible that a part could inadvertently be built 25 times too small or too
large in any one direction?

Answer 6

unit doesn’t transfer in STL file

Question 7

List 8 additional features supported in the AMF standard

Answer 7

unit
curved triangles
color
texture
material
object
constellation
metadata
composite