2.3 3D Printing

Question 1

Fused Deposition Model Advantages

Answer 1

✓ FDM is the most cost-effective way of
producing custom thermoplastic parts
and prototypes.
✓The lead times of FDM are short (as fast
as next-day-delivery), due to the high
availability of the technology.
✓ A wide range of thermoplastic materials
(ABS, PLA, Nylon, etc.) are available,
suitable for both prototyping and
functional applications.

Question 2

Fused Deposition Model Disadvantages

Answer 2

X FDM has low dimensional accuracy and
resolution compared to other 3D printing
technologies, so not suitable for parts
with intricate details.
X FDM parts are likely to have visible layer
lines, so post processing is required for a
smooth finish.

Question 3

Stereolithography Advantages

Answer 3

✓SLA can produce parts with very high
dimensional accuracy and with intricate
details.
✓SLA parts have a very smooth surface
finish, making them ideal for visual
prototypes.
✓Speciality SLA materials are available,
such as clear, flexible and castable
resins.

Question 4

Stereolithography Disadvantages

Answer 4

X SLA parts are generally brittle and not
suitable for functional prototypes.
X The mechanical properties and visual
appearance of SLA parts will degrade
overtime particularly when the parts are
exposed to sunlight.
X Support structures are always required
and post-processing is necessary to
remove the visual marks left on the SLA
part.